rvupgradestore.com Composet Products Fridge Defend
RV Life Magazine RV Park Reviews RV Trip Wizard

Author Topic: tires cupping  (Read 806 times)

kjansen

  • ---
  • Posts: 1310
tires cupping
« on: November 01, 2019, 06:00:47 AM »
While winterizing and checking over the 5er, I notice cupping on the inside all four tires.  Do I have two bent axles or can the wheels be aligned?
Keven Jansen
'06 Chevy 2500 Duramax
'02 Montana Big Sky
Alexandria, Mn

SpencerPJ

  • ---
  • Posts: 2124
Re: tires cupping
« Reply #1 on: November 01, 2019, 06:52:33 AM »
To answer your question, yes you can have wheels aligned, often they bend the axles to get the desired results.  Cupping on the inside can come from many factors.  Alignment and suspension for sure, but tire balance (and trailer tires often are not balanced or done right) and junk tires to begin with.  I would first consider miles on tires, weight on tires, type/quality of tires, and age of tires.  If you take it to a frame shop for inspection, I certainly would have it loaded as you do while traveling. 
2005 YukonXL; 2012 Puma 21BH TT
Paul & Julie

"Never argue with stupid people. They bring you down to their level and beat you with experience" - Mark Twain

Rene T

  • Forum Staff
  • ---
  • *
  • Posts: 14517
  • Every day is payday and every payday I have off
Re: tires cupping
« Reply #2 on: November 01, 2019, 08:00:47 AM »
While winterizing and checking over the 5er, I notice cupping on the inside all four tires.  Do I have two bent axles or can the wheels be aligned?

I would take it to a scale and weigh it loaded just like you were going to travel.  If all looks good, then take it to a truck place that does RV axle alignment like Spencer said. I took mine to a place and they gave me a runoff of what it was before alignment and after. Mine were way out of alignment. I also had severe tire wearing. That was 3 years ago and my tires are wearing perfectly now. 2 of them have over 7000 miles on them and the other 2 have 4500 miles on them.  Make sure to get them balanced also.
Rene, Lucille & co-pilot Buddy
AKA  Pep N Mem
2011 Chevy Duramax 2500 HD 4X4
2011 Montana High Country 343RL
From the Granite State of NH
& Florida Snowbird in Lakeland FL

Gary RV_Wizard

  • Forum Staff
  • ---
  • *
  • Posts: 68893
  • RVer Emeritus
Re: tires cupping
« Reply #3 on: November 01, 2019, 09:17:28 AM »
Cupping indicates the wheel is bouncing or wobbling as it rolls, producing an intermittent wear pattern. It can be cause by bad wheel balance, a bent  wheel or hub, or an extreme alignment issue. Worn shocks too, but that's rare on trailer tires.

Just to be sure we are talking about the same tire condition, your tire shows wear only in spots and not continuously along the surface?   The uneven wear is the distinction between cupping and feathering or edge wear.

This article shows what cupping looks like:
https://www.utires.com/articles/back-tires-cupping/
Gary
--------------
Gary Brinck
Summers: Black Mountain, NC
Home: Ocala National Forest, FL

kjansen

  • ---
  • Posts: 1310
Re: tires cupping
« Reply #4 on: November 02, 2019, 01:42:35 PM »
They are cupping and were balanced when new.  I have the exact same tire on my pickup and they are in great shape after 5-6 times more miles on them.  The shocks are 2002 original and I have thought about replacing them.  Right now I am checking into the cost of re-alignment verses new axles.  These are 7,000 pound axles on a 35 foot 5er.  I will wait til spring to have it weighed unless I leave Minnesota for wartmer climates this winter.
Keven Jansen
'06 Chevy 2500 Duramax
'02 Montana Big Sky
Alexandria, Mn

Gary RV_Wizard

  • Forum Staff
  • ---
  • *
  • Posts: 68893
  • RVer Emeritus
Re: tires cupping
« Reply #5 on: November 02, 2019, 04:03:54 PM »
Could be worn spindles or bad bearings too. If the wheel wobbles as it rotates, the tire will cup.

A bent axle usually causes feathered edge wear due to a wheel camber problem (the  axle bent up or down). Either inner or outer edge wears, but evenly. Trailer axles don't develop a toe in/out problem like the steer axle on a car or truck - they are fixed in place. The axle has to get bent forward or backward at the middle to cause toe problems.  Rarely  would the entire axle get far enough out of line to cause wheel hop.  I'm betting on bearings, or bent hub/spindle.  An alignment shop can tell you if the axles are a problem, or you can DIY an axle measurement to determine if they are correct or not.

This article should help.

https://www.centrevilletrailer.com/how-tos/trailer-axle-alignment-trailer-tire-wear/
Gary
--------------
Gary Brinck
Summers: Black Mountain, NC
Home: Ocala National Forest, FL

keymastr

  • ---
  • Posts: 630
Re: tires cupping
« Reply #6 on: November 18, 2019, 12:25:02 AM »
If all four are wearing on the inside edge it is likely from the axles being overloaded. The weight bends them so the top of the tire is tilted inboard a little and that makes them ride on the inside edge of the tire. If just one tire was showing that wear it would be much more likely a bent axle.

donn

  • ---
  • Posts: 3638
Re: tires cupping
« Reply #7 on: November 18, 2019, 07:30:15 AM »
2002 fiver?  Have you replaced the plastic spring eye bushings ever?  Like others have said, there are a myrid of things that could be contributing to the issue.  Before you spend any time on  alignment be absolutely sure all of the suspension is up to snuff.  Spring  eye bushings, springs, hangars, wheel bearings.  Once you have fixed all the worn out parts head to the alignment shop.

steveblonde

  • ---
  • Posts: 2873
Re: tires cupping
« Reply #8 on: November 18, 2019, 08:32:05 AM »
They are cupping and were balanced when new.  I have the exact same tire on my pickup and they are in great shape after 5-6 times more miles on them.  The shocks are 2002 original and I have thought about replacing them.  Right now I am checking into the cost of re-alignment verses new axles.  These are 7,000 pound axles on a 35 foot 5er.  I will wait til spring to have it weighed unless I leave Minnesota for wartmer climates this winter.
trailer axles are rarely straight and can be straightened - look for a standens or associate close to you they will do it np
2015 Voltage 3305 Toy Hauler - loaded
2019 F150 5l Super cab 8 ft box (company truck) daily driver
2017 Black on Black F350 Diesel Dually loaded  5167lbs cargo/weight capacity
Selling truck parts for 15 yrs plus
" If you're not living on the edge you're taking up too much space"
From Canada Eh

FastEagle

  • ---
  • Posts: 580
Re: tires cupping
« Reply #9 on: November 18, 2019, 11:24:13 AM »
While winterizing and checking over the 5er, I notice cupping on the inside all four tires.  Do I have two bent axles or can the wheels be aligned?

See page 20 in the reference.

https://www.keystonerv.com/media/9141971/keystone-owners-manual-2019.pdf
USN RET (PDRL)
DOD RET Journeyman Aircraft Mechanic
SSA RET
http://fasteaglervparking.blogspot.com/

Gary RV_Wizard

  • Forum Staff
  • ---
  • *
  • Posts: 68893
  • RVer Emeritus
Re: tires cupping
« Reply #10 on: November 18, 2019, 12:46:36 PM »
Kjansen says the tires are cupping, not wearing evenly along the inner edge.  Different symptoms.
Gary
--------------
Gary Brinck
Summers: Black Mountain, NC
Home: Ocala National Forest, FL