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Author Topic: New Tires  (Read 6131 times)

stegosaurus

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New Tires
« on: May 11, 2010, 09:34:58 AM »
Has anyone out there got current information on whether or not Michelin XZE Highway 245/70 19.5 Tires are good? I have tires that are 6 years old (came with the RV that I purchased in February) and want to replace them for safety. The local Tire Discounter store has them at $400 each mounted balanced a valve stems included. i checked with the nearest Camping World which is in Indy (about a 90 minute drive each way) They are getting about $380 each for Goodyear. Not sure if that is mounted or not.

Being a neophyte, I need your advice.

Thanks

Steg
Paul and Mary Beth and Aleut and Miska (Samoyed Dogs - decision makers for the family)
2004 Monaco Monarch 30'PDD

WhiteEagle

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Re: New Tires
« Reply #1 on: May 11, 2010, 10:04:46 AM »
Best to make sure of the tire dates on the ones they are quoting to sell you.... they may not be recently manufactured ? .... at 7 years of age replacement target, each 6 months of "new tire age"  is equal to a little over 7% of the next repacement cost.....
2009 AB 40QSP-Powerglide-Cummins ISL 8.9L DP-Allison 3000-2 stage Jake Brake-Michelin 295R80 22.5-Pressure Pro System-Jeep GC Toad-Blue Ox Plate, Bar, Patriot Braking System-10K Genset-AquaHot-4 Panel Solar-SurgeGuard. Northern WI base
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seabreeze331

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Re: New Tires
« Reply #2 on: May 11, 2010, 05:22:19 PM »
I just replaced all 6 tires. The ZXE was going to be my first choice until a bit more research (a lot from here) made me decide on the XRV. I've put almost 3500 miles on them and could not be more pleased. Gas mileage went up from 8 to 9/10 average. The ride is just fabbuulus. Michelin has always been my choice but when it totals $2300, ouch but it's whats on top of the tire that counts.
Durwood  (Dt)
2002 American Eagle 40T
04 Liberty Sport/ 06 Z71 crewcab (where I go dictates what I tow)
Hail from the North (North Carolina) transplanted to the FL panhandle

AndyinLexington

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Re: New Tires
« Reply #3 on: May 11, 2010, 07:01:32 PM »
I am looking at this same decision.  We have a 2000 Holiday Rambler Admiral 34F, and the tires that came on it when we bought it recently are not matched.  The front are 3 years old, name brand, but the rears are some chinese made brand and don't even have a date stamp on them.  They look brand new, but I am not convinced it would be a good idea to head off across the country (heading to Connecticut in a couple of weeks) with these.  I got a quote from a local S and S truck tire center to replace with Michelin ZXEs for just under 2500 for six tires.  Sam's club sells the tires for about 300 each plus tax, not mounted. 

I do have a spare, but it looks like a ten year old goodyear that came with the motorhome.

I'm thinking about chucking all seven and just getting a matched set of Michelin's but don't want to just throw money away either.  I'd welcome any thoughts from those on here about this.

Andy
Andy Holmes
2000 Holiday Rambler Admiral 34F
2005 Chev Malibu Toad
N1CPS
Lexington, Kentucky

camperkids1025

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Re: New Tires
« Reply #4 on: May 12, 2010, 09:06:31 AM »
I just purchased 6 Michelin XZE Load Range H tires here in Maryland for my Mountain Aire at the cost of 2380.00 out the door. That's mounted - balanced with the beads inside the tire, new valve stems and the good old tire disposal fee and the taxes for the State of MD.. I just bought the Motorhome it already had Michelins on it (dry rotted) so I decided to go with them again. It may cost more that some others but you get what you pay for and that's not to say there aren't other good ones out there. JMHO  Jim
Jim & Lois in Maryland
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Gary RV Roamer

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Re: New Tires
« Reply #5 on: May 12, 2010, 09:42:48 AM »
Those Chinese tires must have a DOT sidewall stamp, including the date, to be legal for sale in the US. Can't even import them without it.  Look on the back side of the tire - it has to be only on one side. And some Chinese sounding names are in fact good, reliable tires from factories elsewhere in the Far East, e.g. Kumho or Hankook. They are widely used by truck fleets. Maybe not quite as good as a Michelin, but only half the price.

There is no need to worry if the fronts do not match the rears, but the tires on any one axle should be the same make & model & age.
Gary
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2004 American Tradition
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Homebase: Ocala National Forest, FL

AndyinLexington

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Re: New Tires
« Reply #6 on: May 16, 2010, 07:09:09 PM »
Thanks, Gary.  I will look again.  I just took a quick look when I picked up the motorhome, and have not crawled under there to look at the back side yet.
Andy Holmes
2000 Holiday Rambler Admiral 34F
2005 Chev Malibu Toad
N1CPS
Lexington, Kentucky

Rancher Will

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Re: New Tires
« Reply #7 on: May 25, 2010, 07:30:27 AM »
Over the past 60 years I have purchased and used numerous brands of tires on many types of equipment. One item that I have not noticed on this forum is the discussion of warranties for tires. Michelin is one company that does not have any warranty for it's tires for any reason. Many other tire companies do have warranties, covering various conditions.

Tom

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Re: New Tires
« Reply #8 on: May 25, 2010, 07:45:50 AM »
Quote from: Rancher Will
Michelin is one company that does not have any warranty for it's tires for any reason.

If they don't have a warranty, somebody might want to tell Michelin to remove their tire warranty information from their web site:

Quote
All Michelin® tires have a limited warranty, which covers defects in   workmanship and materials for the life of the original usable tread, or   for 6 years from date of purchase, whichever occurs first.

Getting them to honor the warranty might be a different subject; Many of us have not had a good experience in that department.
« Last Edit: May 25, 2010, 07:50:38 AM by Tom »
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PatrioticStabilist

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Re: New Tires
« Reply #9 on: May 25, 2010, 08:07:54 AM »
I was wondering about tire pressure, not sure where I posted it but one of you guys said give you the info.

On the front are new Michelin 245/70 R19.5 XZE with a manufacture date of May of this year.

The back 4 are Goodyears same number.

I wanted to know the air pressure to put in the front, the back ones inside are 80psi.  I can't check the back outside tires even with the truckers gauge, the stems are facing toward the inside.  My husband Tom, I think, has a gauge on a hose that bends that maybe I can get to otherwise I need extensions even on that, hubby said he has some and doubt I go anywhere else till after he is home on leave and gone again.  I stopped at an RV place and he couldn't test them either, so don't know.

The fronts had 95, I let 10 out after seeing inside that it was to be 70psi.  However, when testing warm they tested 95. They say max of 120.

My understanding is I need to have the coach weighed then each tire.  We have a gravel pit at the end of the road I will check there.  Or does anyone know if the Flying J at 59 and 242 has a scales.  If so I will take it there and get it weighed.  Do I need full tanks of fuel, water, etc?

I know crosswind were an issue but I'm thinking also maybe I don't have these inflated to the correct pressure.
Added 1992 American Eagle diesel pusher 38 ft

Winnie Sightseer 29 ', 2005 Class A 2 slides!  Bought 5/5/2010, Sold 1/7/2012. Added Tru Center , Trac Bar,  Air bags, Bilstein shocks Compressor for air bags, new awnings . New tires. New satellite dome, 2 flat screens
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Ned

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Re: New Tires
« Reply #10 on: May 25, 2010, 08:40:03 AM »
It's best to get each wheel weight separately but that's not always easy to do.  Next best is to get axle weights and you should be able to do that at the gravel pit or truck stop.  Have the RV loaded as for travel, which is usually empty holding tanks and at least half a tank of water.  If you can't get it weighed for some reason, the we can use the gross axle weights but that may result in over inflation at worst, not necessarily bad.  But you do need to get actual weights to see that you're not overloading an axle.

The Goodyear inflation tables are here and the Michelin tables here.
-- Ned -- Fulltimer 1997-2013
1997 Holiday Rambler Endeavor LE
2007 GMC Canyon

Want to know what we're doing? http://blog.usabyrv.us

DOUG G

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Re: New Tires
« Reply #11 on: May 25, 2010, 12:58:13 PM »
YOU MAY WANT TO CHECK MOST TIRES ARE MANUFACTURED OUT OF THE COUNTRY.FIRESTONE AND BRIDGESTONE ARE IN ILLINOIS.

ferfer

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Re: New Tires
« Reply #12 on: May 25, 2010, 05:39:22 PM »
We too are looking for 6 new tires due to age/safety.  We currently have Goodyear G670 245/70R19.5 Load Range F.  I can get the same tire but with a manufacturing date of xx08.  Too old I think.  I can get the G670 Load Range G manufactured last couple week of '09 or '10 or Continental with Load Range H for about 550+ less then the G670 G'sand manufacture date 4609. 

I do not know anything about the new RV Continental tires.  Anyone have experience with them?  I also do not know what effect the higher Load Range of G or H will have regarding ride and tire pressure.  Evidently there is a tire pressure recommendation by Georgie Boy and do not know how this be effected either.   

It also looks like Goodyear changed tires in Feb. 06 which changed the tire pressure vs. weight. (http://www.goodyear.com/rv/products/g670.html Load Inflation Tables)

LOAD/INFLATION INFORMATION FOR RV TIRES
TIRE LOAD LIMITS (LBS) AT VARIOUS COLD INFLATION PRESSURES (PSI) HIGHWAY STEER AND ALL-POSITION TREAD
DESIGNS USED IN NORMAL HIGHWAY SERVICE*   S=Single, D=Duel
                    MPH         PSI                               
                                 70     75     80         85       90      95     100      105     110
245/70R19.5  75  S 3640 3740 3890 4080(F) 4190 4335 4540(G)
                           D  3415 3515 3655 3970(F) 4115 4265 4410(G)
†245/70R19.5 75 S                   3640 3740 3890 4080(F) 4190 4335 4540(G)
                            D                   3415  3515 3655 3970(F) 4115 4265 4410(G)
† Tires produced after 2/28/06.

Also the Continental and one source for the G670 F or G Load Range would he high speed spin balanced vs. Camping World would use Equal for the G670.

Any clarification or advise is greatly appreciated.  I am likely making this harder then it has to be but...my tire knowledge is limited.

Thanks,  Jennifer
2004 Georgie Boy Pursuit 3500DS  aka QSHOUSE
Jennifer, Dan and Q, a Bearded Collie & real owner + Scooter QT, the moppet ++ Mattie, the inheritance dog(RIP 5 June, 2014)

Ned

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Re: New Tires
« Reply #13 on: May 25, 2010, 06:22:14 PM »
I haven't heard any negative reports on the Continental tires.  A higher load range should let you run them at a lower pressure and give a somewhat softer ride.  More importantly, the original tires are probably running at their maximum load so you'd have a higher margin of safety with the higher LR tires.

But load ranges aren't directly comparable across manufacturers, so check the inflation tables for the Continentals before making a choice.

As for balancing, I would recommend Equal, or even better, DynaBeads, instead of spin balancing.  We've used Equal for about 10 years and have had no problems with it.  Next time we buy tires, I'll probably switch to the DynaBeads but either is a good choice.
« Last Edit: May 25, 2010, 06:24:16 PM by Ned »
-- Ned -- Fulltimer 1997-2013
1997 Holiday Rambler Endeavor LE
2007 GMC Canyon

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ferfer

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Re: New Tires
« Reply #14 on: May 25, 2010, 07:30:24 PM »
Ned, thanks.

The Continental site only gives the max. rating of 115psi:  single = 4940 lbs.,  duel = 4675 lbs and they only offer H load range for their HSR-1 245/70R19.5 tire.  (http://www.conti-online.com/generator/www/us/en/continental/transport/themes/people/rv/hidden/regional_steer_en.html  HSR 1 - Product Brochure: View)

Maybe tomorrow night I can con my better half into this thread and he can ask the questions that are bugging him.  I confess that I do not understand his concerns so I can not express them clearly.  I know he is concerned about what pressure the tires should be and how to adjust the psi recommended by Georgie Boy to the new tires, effect of higher load range on ride and how Continental rates compared to the Goodyear G670.  He has heard that the G670 is the best or gold standard - so to speak.   I told him I thought he would have to adjust anyway because it looked like Goodyear changed the psi to weight ratio in 2006.

I should state that Dan is an Ch. engineer so it is going to bug him until he figures all this Load Range impact out. 

Jennifer
2004 Georgie Boy Pursuit 3500DS  aka QSHOUSE
Jennifer, Dan and Q, a Bearded Collie & real owner + Scooter QT, the moppet ++ Mattie, the inheritance dog(RIP 5 June, 2014)

Ned

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Re: New Tires
« Reply #15 on: May 25, 2010, 07:55:34 PM »
First, the tire pressures recommended by Georgie Boy are for the original tires only.  Unless you replace them with the exact tires, you can ignore the recommended pressures and have to rely on the manufacturers tables.

It appears that Continental only shows the inflation pressure for maximum load on their tires.  I haven't found a load vs. PSI table for them.  If you're at close to the maximum weight for the tire, then use the pressures in the table.

Don't be concerned about the 2006 date as any tires you buy today should have 2010 dates.
-- Ned -- Fulltimer 1997-2013
1997 Holiday Rambler Endeavor LE
2007 GMC Canyon

Want to know what we're doing? http://blog.usabyrv.us

ferfer

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Re: New Tires
« Reply #16 on: May 25, 2010, 09:22:20 PM »
Thanks again Ned.  I think I am starting to understand.  The GB recommendation was 85PSI and that is the max. load for the G670's currently on QSHOUSE (GB).  If we get new G670's LR F the max PSI would increase to 90PSI for same load according to Goodyear table.  If we got to the LR G then we would have more load available if we need it but could reduce the tire pressure to match the actual load. 

Also, I think I understand Dan's concerns better.  What he is worried about is the will the G or H load range effect the handleability and control in addition to the smooth ride with reduced tire pressure.  How will the higher load range effect the steering and all those other factors.  He is concerned that GB geared the motorhome to 85PSI as optimal and an increase in pressure will adversely effect performance and maybe do damage.  I am trying to state this but fear once again doing a bad job.  :'(  He is recalling to the Explorer/Firestone tire pressure snafu that caused all the problems years ago.

I also emailed Continental to see if they have a load vs. PSI table and will let you know what they say.  If they do not I think it would be like shooting in the dark to try to match tire pressure to load. 
2004 Georgie Boy Pursuit 3500DS  aka QSHOUSE
Jennifer, Dan and Q, a Bearded Collie & real owner + Scooter QT, the moppet ++ Mattie, the inheritance dog(RIP 5 June, 2014)

Ned

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Re: New Tires
« Reply #17 on: May 26, 2010, 06:21:54 AM »
Going up in tire size has other considerations than just the inflation pressure.  The tires will usually be larger and you need to ensure that there are no clearance problems.  Especially see that there is sufficient spacing between the duals so they don't rub.  You don't need to go up more than one load range, and running the tires at the proper pressure won't cause any handling problems.  Most run at the table pressure plus 5 or 10 psi to allow for drops in temperature that will drop the cold pressure, and for the eventual air loss over time.

RV manufacturers will use the smallest (cheapest) tire to support the RV and thus will recommend using the maximum inflation pressure for the tire.  On our motorhome, the original Goodyear G159 tires were the limiting factor for the GAWR, the actual axle ratings were higher than Holiday Rambler posted for the chassis.  At the first tire change, we went up one load range in the Goodyears to the G169 and now have the G670RV tires.  They are run at well below maximum pressure and there is no difference in handling.
« Last Edit: May 26, 2010, 06:25:42 AM by Ned »
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Gary RV Roamer

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Re: New Tires
« Reply #18 on: May 26, 2010, 07:13:00 AM »
Increasing the load range on an identical size tire generally increases sidewall stiffness slightly. I doubt if it would be noticeable to most drivers on most coaches and on a trailer it probably results in a reduced tendency to sway.

Changes in size, i.e. tread width, diameter, or profile, can possibly affect steering geometry on but small changes generally do not. A "small change" in my book is any that has 0.5" or less effect on the rolling circumference or sidewall height, but that's just a figure of merit. Mostly for the sake of argument, trying to put some meaningful measure on 'small" and certainly not an absolute.
Gary
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Gary RV Roamer

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Re: New Tires
« Reply #19 on: May 26, 2010, 07:30:03 AM »
Quote
I do not know anything about the new RV Continental tires.

I just want to dispel any notion that Continental is a "new" brand, even in the USA. They are a large, global company with substantial businesses in automotive products and rubber goods, so tires are a natural for them. They have been in the tire business for over 100 years and produce tires for everything from bicycles to heavy trucks, including some high end cars like BMW. Heck, I had Continental snow tires for my '62 Pontiac. They offer excellent performance at an attractive price.

The only  thing "new" about Continental tires is that the mainstream of RVing is just discovering them.
Gary
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Gary Brinck
2004 American Tradition
2007 GMC Acadia
Homebase: Ocala National Forest, FL

ferfer

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Re: New Tires
« Reply #20 on: May 26, 2010, 03:14:33 PM »
Got reply from Continental regarding load vs. PSI table:


Jennifer,


Please find below, specified PSI inflation pressures recommended for 245/70R19.5 size products:

   PSI          80      85      90       95       100      105      110       115      120                                                     
  Dual       3415  3515  3655  3860(F)  3940  4075   4300(G)   4345   4540(H)
  Single    3640  3740  3890   4080(F)  4190  4335   4540(G)   4620  4805(H)

You need to adjust inflation pressures according to the weight of which is distributed across each axle of his/her vehicle. For example: If the gross vehicle weight of the vehicle is 25,000 pounds and the front axle is carrying 8,500 pounds of weight, the front tires are carrying 4,250 pounds per tire. If this were the case, each front tire would need inflated to 105 PSI as a single application.

The rear axle would then be carrying 16,500 pounds across the number tires on the vehicle (4). This would require each tire to be inflated with the same 110 PSI (16,500/4 = 4,125 pounds) in a dual application.

The pressures listed above are provided as a means of explaining how to configure inflation pressures within each tire and does not necessarily mean that you should use the inflation pressures provided within the example. Gross vehicle weights vary per vehicle and each owner MUST adjust tire inflation pressures according to your specific gross vehicle weight, axle weight distribution and application.

Please take into consideration, these 245/70R19.5 HSR1 products are rated for speeds up to 81 miles per hour. Exceeding the lawful speed limit is not recommended nor endorsed. Doing so would nullify any warranty or claim against these products and would jeopardize the safety of those within the vehicle.

Hope this helps!

Tamiko Diggs Martin
Continental Tire the Americas, LLC
Inside Sales Supervisor-Commercial Vehicle Tires
704-583-3904 direct dial
980-253-0839 mobile
704-583-4806 fax

I knew Continental was an established tire company but they are new to "RV" specific tires.   I guess they have had them but not marketed them to the RV market or is this a new tire for them?   

Hard to compare the two companies but here is what I could compare based on Goodyear info. tables.  Continental has additional info. lNoted difference:  The Tread Depth is lots deeper, the Overall Width slightly larger but the Outside diameter is smaller.  Do you see anything positive or negative - any red flags or yellow caution signs?

                                        Tread                             Meas.                                         Max Load at
Tire Size       Load   Side   Depth       Apprvd.         Rim       Overall     Outside       Infla. (PSI)
                   Range  wall   (32s)        Rim Widths    Width    Width     Diameter         Single

245/70R19.5 F         BL    13.5           6.75, 7.50     7.50       9.7           33.0          4080@95        Goodyear
245/70R19.5 G        BL    13.5           6.75, 7.50     7.50       9.7            33.0          4540@110     Goodyear
245/70R19.5 H         -      16             7.50, 6.75        -          9.8            32.9          4940@115    Contenintal

Now if I just knew what my wheel was rated for and if it could handle the higher load range??

I am so confused but still trying to figure this out.  Who knew buying tires could be so confusing??  All this started because I am trying to get an recent mfg. date and I can get late 09 or 10 mfg. date for the higher LRs.  The Goodyear LR F are all 2008 mfg. dates.

Jennifer
2004 Georgie Boy Pursuit 3500DS  aka QSHOUSE
Jennifer, Dan and Q, a Bearded Collie & real owner + Scooter QT, the moppet ++ Mattie, the inheritance dog(RIP 5 June, 2014)

Gary RV Roamer

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Re: New Tires
« Reply #21 on: May 26, 2010, 03:36:18 PM »
Quote
I knew Continental was an established tire company but they are new to "RV" specific tires.

The HSR1 is not an RV specific tire - Continental designates it as a "Heavy Steering Regional" tire, which makes it suitable for the front wheels on any medium-heavy duty vehicle that uses those sizes and load range.

I think what you are seeing is that dealers are looking around for more cost effective answers to their customer's tire needs and have found that Continental, Bridgestone, Yokohama, Toyo, etc. are primed and ready to fill their needs. You get a major brand tire with full warranty at an attractive price from a company with a proven track record.
Gary
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Gary Brinck
2004 American Tradition
2007 GMC Acadia
Homebase: Ocala National Forest, FL

ferfer

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Re: New Tires
« Reply #22 on: May 26, 2010, 06:50:42 PM »
I do not doubt that the Continental tire would be good tire.  I am getting the same size tire but a higher load range.  It is the load range that has me concerned.  I need to fine or determine the max. wheel weight rating for QSHOUSE.    Wheel load rating requirements are determined by dividing the vehicle's heaviest gross axle weight rating (G.A.W.R.) by 2 if it not written on the wheel.  From what I am reading it is not recommended to get a higher Load Range tire then the wheel is rated for.  Maybe that warning is so one does not fill the tire to its max. PSI - which we would not do - and thus exceed the wheel load max. rating.  I have not found anywhere where they give a reason for the LR vs wheel load capacity.

More information need.  I am leaning toward the Load Range G by Goodyear G670.  I do not think that would be too far off but without knowing the wheel rating I am leary of the Continental LR H.

Please fell free to explain the error of my thinking as I am not an expert.  Just trying to learn before I get in over my head.  :P

Jennifer

2004 Georgie Boy Pursuit 3500DS  aka QSHOUSE
Jennifer, Dan and Q, a Bearded Collie & real owner + Scooter QT, the moppet ++ Mattie, the inheritance dog(RIP 5 June, 2014)

Gary RV Roamer

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Re: New Tires
« Reply #23 on: May 26, 2010, 07:54:20 PM »
It is not unusual for the wheel on a big coach to be rated at less than the max possible pressure for it's tires. You just have to observe the lower limit.  The wheel load limit is usually stamped on it, but may not be visible without dismounting the tire.  Do you know the brand and model of wheel?

My wheels are rated at 125 psi, which also happens to be the top pressure for my G670 295/80R22.5 tires.
Gary
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Gary Brinck
2004 American Tradition
2007 GMC Acadia
Homebase: Ocala National Forest, FL

ferfer

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Re: New Tires
« Reply #24 on: May 27, 2010, 02:35:02 PM »
Gary,

I am sorry to say I do not know the max. load limit or the max. PSI limit of our wheels -  and of course the wheels are hidden by wheel coveres.     Dan is planing to get the manuals out of storage tonight so maybe I can find something.  We do have a spare but I do not know if Dan is going under tonight.

We have the Ford F53 22,000 lbs. GVWR chassis.  Based on 2008 data looks like our front axle = 7500 lbs. and rear axle = 14500 lbs.  If the formula works: 
                  7500/2 = 3750 lbs each front wheel
                14500/4 = 3625 lbs each rear wheel

Hummm, If above true then we've been over inflating the tires and that is per GB recommendation.   Also there is not a good fit of one PSI = single, duel combo - which means that you have different PSI in the front tires vs. the rear tires. 

I also realize the tire PSI/weight tables do not go low enough.  On trip last year, the each rear tire carried 3155 lbs and front carried 3280 lbs. ... and the Goodyear table weights listed are all higher.

I'll get back with hopefully with more understanding and info. but I am beginning to realize that it really higher Load Range is OK. but the load range table will not go low enough for actual weight on tires. 

Hope to find good info. when Dan gets home.  Please wish me luck.

Jennifer
2004 Georgie Boy Pursuit 3500DS  aka QSHOUSE
Jennifer, Dan and Q, a Bearded Collie & real owner + Scooter QT, the moppet ++ Mattie, the inheritance dog(RIP 5 June, 2014)

Ned

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Re: New Tires
« Reply #25 on: May 27, 2010, 03:37:47 PM »
If your weights are less than the lowest shown in the table, then inflate to the minimum pressure shown plus 5psi.
-- Ned -- Fulltimer 1997-2013
1997 Holiday Rambler Endeavor LE
2007 GMC Canyon

Want to know what we're doing? http://blog.usabyrv.us

Lou Schneider

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Re: New Tires
« Reply #26 on: June 03, 2010, 04:36:20 PM »
Quote
A higher load range should let you run them at a lower pressure and give   a somewhat softer ride.

That's not right, Ned.   Look at the load tables - for a given tire size the inflation pressure vs. load is the same regardless of the tire's Load Range.   The difference is the higher rated tire can be inflated further to handle heavier loads.

In other words, if the load is within the rating of an "F" range tire, going up to a "G" range won't let you lower the pressure.   The "G" rated tire will require the same pressure as the "F" at that load.

Ned

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Re: New Tires
« Reply #27 on: June 03, 2010, 05:31:11 PM »
You're right, Lou, if the tires are the same size.  Generally, when going up a load range, you are also going up a size and that lets you run at a lower pressure for the same load.  My original G159 LR G tires required a minimum of 95psi for my axle weights but my G670 LR H tires can be run as low as 80psi for the same weights.
-- Ned -- Fulltimer 1997-2013
1997 Holiday Rambler Endeavor LE
2007 GMC Canyon

Want to know what we're doing? http://blog.usabyrv.us

ferfer

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Re: New Tires
« Reply #28 on: June 03, 2010, 06:55:59 PM »
I think some (a lot?)of the confusion is my fault.  Georgie Boy recommended 85 PSI for our Goodyear G670 245/70R19.5 F tires manufactured in 2003 and that is the pressure Dan has been keeping the tires.   The 85 PSI is also the highest load for these tires and covers the load if the motorhome was loaded to the 22,000 lbs. GVWR of our chassis.  I perhaps erred thinking since we have never loaded the motorhome to 22,000 lbs. we could lower the pressure and adjust it to our actual load.  BUT the tables do not go low enough to cover us which is what Ned responded to.  In hind sight this is not a good practice and I have beat myself with a wet noodle.  :o

However in Feb. 2006 Goodyear changed the method of manufacture of the G670 245/70R19.5 tire and it increased the pressure from 85 PSI to 95 PSI for the same F load range.    Took some doing but finally got Dan to agree.  He is still contacting people but did get Ford and some other tire knowledgeable people to agree with the increase to 95 PSI for same F load rating.  The PSI/load range weights are consistent with small amount of weight difference between Goodyear and Continental tires.

Current thinking is if we get the G or H instead of the F load range tires we would use the 95 PSI for load range F.  The whole reason for getting the G or H load range is to get more current manufacturing dates as the Goodyear F load range tires are all 2008.

We still do not know what our wheels PSI rating is.  Dan did crawl under and look at the spare but no markings.  We ordered the missing Dicor tool required to remove the wheel covers and hopefully we will be able to find a PSI rating.   Wish us luck.

The one thing I have learned out of all this is one must look at the tire manufactures' load range chart.  Things change and your safety is riding on those tires.  I can see where it would have been easy for Dan to continue using 85 PSI for the new tires and thus under inflating them.

Jennifer
2004 Georgie Boy Pursuit 3500DS  aka QSHOUSE
Jennifer, Dan and Q, a Bearded Collie & real owner + Scooter QT, the moppet ++ Mattie, the inheritance dog(RIP 5 June, 2014)

Rancher Will

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Re: New Tires
« Reply #29 on: June 05, 2010, 07:39:07 AM »
Tom, I concur with the last sentence in your comment about Michelin tires. My original statement about Michelin was not intending to "bad mouth Michelin", but only to provide information. However, after reading your comment I thought perhaps Michelin had changed it's policy. So, without intending to be argumentative, let me provide some more info.
Some years ago I took delivery of a Freightliner semi truck that came with 10 new Michelins. Within 5 months I lost 7 of the 10 tires, all from blow-outs on the sidewall. All of the seven Michelin dealers where the blow-outs occured, (in Texas, Colorado and New Mexico) informed me at the times that "there was no Michelin Warranty". ( I did complain after the seventh blow-out to Denver Freightliner, where I had bought the truck. Denver Freightliner, although the truck company does not warranty tires, did make it right with me.)
Since I have been a rancher since 1954 I have had and do own quite a number of tires of all types and makes. So I try to keep up with the latest info on equipment.
Last summer, at the Greeley, Colorado annual Farm Show, I discussed Michelin tires with the Michelin rep at the tire booth there. As of last summer, the Michelin tire rep there informed me that Michelin has never had a tire warranty. However, Just to see if Michelin has recently changed it's warranty policy, yesterday I called my farm tire dealer, TDS in Craig, Colorado. I was informed that TDS knows of no tire warranty by Michelin. Then, just to see if there might me a difference among dealers, I phoned the Wheatridge, Colorado TA Truckstop where I do business when in the Denver area with my semi. The Service Manager there infromed me that TA knows of no Warranty by Michelin for tires. The TA Service Manager gave me the phone number of the Michelin regional manager in Denver. I phoned the Denver regional Michelin Manager and was informed that Michelin has no warranty. However the manager informed me that on occasion, especially for fleet customers, when he is requested, he has in the past, and can at his discretion, make "adjustments" for tire problems involving Michelin tires. He stated that he will consider each case individually.