Frank B said:Or hitting a curb.
Never happened to me though.
Frank B said:Or hitting a curb.
Rene T said:With situations like this, aTPMS system would have paid for itself real quick. Tires start to go low in pressure and before it has a chance to fall apart, I'm aware of it and have all the time in the world to pull off to inspect.
Max load ratings are pretty much constrained by the tire size, so there is only so much you can get with a reasonable width, 15" or 16" tire. I've seen a very few trailers with 19.5" wheels, but that is high end custom stuff. A 16k 5W will have a minimum 3200 lb, leaving 12,800 lbs on two trailer axles. Four tires, thus needing 3200 lbs each minimum. 3600-4000 lbs per tire is decent for that amount of weight. The axles are probably rated at 7000 lbs each anyway.Doing a little searching the highest load rating trailer tire I've found is a G rated around 4000 lbs - are there higher rated ones? With trailers in the 15-16K range, even allowing for 2500ish pin weight, on a two axle trailer it seems like the tires are at or even over the G load. I would think trailers of this weight should be running tires rated at 4500-5000 pounds, if there is such an animal
A 15k-16k trailer can have a 20 percent hitch weight = 3000-3200 lbs which may leave around 12800 lb on the trailers axles or 3200 lbs per tire approx weight.Sun2Retire said:Doing a little searching the highest load rating trailer tire I've found is a G rated around 4000 lbs - are there higher rated ones? With trailers in the 15-16K range, even allowing for 2500ish pin weight, on a two axle trailer it seems like the tires are at or even over the G load. I would think trailers of this weight should be running tires rated at 4500-5000 pounds, if there is such an animal
longhaul said:It comes in a ST235/80-16 G at 4080 lbs capacity.....or a ST235/85-16 G at 4400 lbs capacity. These tires work great on trailers with 7k and 8k axles.
Bobtop46 said:Don't just look at the weight rating of a tire. Look at the speed rating.
Sun2Retire said:True, all ST tires have a 65 MPH rating
Yeah ... many ST class tires today carry a L or M speed rating. There maybe a few maypops still left that carry the old 65 mph speed ratings.postmandug said:That's funny. My ST tires have a speed rating letter of L. It also states right beside that 75MPH...........
Bobtop46 said:Tire Tech: Trailer Tires vs. Passenger Vehicle Tires
There are differences in the driving requirements between the tires on your trailer and those on the car or light truck you use to tow it. Therefore, there are distinct differences between the way trailer tires and tow vehicle tires are engineered.
Your tow vehicle is a leader, which means traction is a key focus in the design of its tires. Traction allows your tow vehicle to accelerate down the road, turn around the corner and brake to a stop. Another important consideration is tow vehicle tires are designed for ride comfort, which is achieved in part by allowing their sidewalls to flex.
Your trailer is a follower, which often makes tire sidewall flexing a negative. Sidewall flexing on trailers, especially those with a high center of gravity (enclosed/travel trailers) or that carry heavy loads, is a primary cause of trailer sway. Typical passenger radial tires with flexible sidewalls can accentuate trailer sway problems. The stiffer sidewalls and higher operating pressures common with Special Trailer (ST) designated tires help reduce trailer sway.
"Trailers will be more stable and pull better on tires designed specifically for trailer use. Since Special Trailer (ST) tires are constructed with heavier duty materials, they are tougher than typical passenger vehicle tires."
Also consider that Special Trailer (ST), as well as Light Truck (LT) tires are fully rated for trailer applications. This means ST- and LT-sized tires can carry the full weight rating branded on the sidewalls when used on a trailer.
However when P-metric or Euro-metric tires are used on a trailer, the load capacity branded on the sidewalls must be reduced by 9%. This means P-metric or Euro-metric tires with a maximum branded load rating of 1,874 lbs. for use on a car is only rated to carry 1,705 lbs. when used on a trailer.
Comparing the load capacities of a pair of tires of the same dimensions fitted to a single axle trailer, ST225/75R15 Load Range C-sized tires inflated to their maximum of 50 psi provide 4,300 lbs. of load capacity, where P225/75R15 Standard Load-sized tires inflated to their maximum of 35 psi would be limited to 3,410 lbs. of load capacity, a total reduction of 890 pounds.
Trailers will be more stable and pull better on tires designed specifically for trailer use. Since Special Trailer (ST) tires are constructed with heavier duty materials, they are tougher than typical passenger vehicle tires. This is a plus because trailer suspension systems are generally stiffer and less sophisticated than automotive suspension systems.
Special Trailer (ST) Tire Speed Ratings Industry standards dictate tires with the ST designation are speed rated to 65 MPH (104 km/h) under normal inflation and load conditions. (When the sidewall has no speed markings).However Goodyear Marathon and Power King Towmax STR tires featuring the ST size designation may be used at speeds between 66 and 75 mph (106 and 121 km/h) by increasing their cold inflation pressure by 10 psi (69 kPa) above the recommended pressure for the rated maximum load. ((Maxxis has also made that statement). That procedure is good for all ST & LT tires. However, tire manufacturer's will not blatantly trump a vehicle manufacturers vehicle safety guidance. This is from the 2019 Keystone RV trailer owner manual; Because tires are designed to be used on more than one type of vehicle, tire manufacturer's list the ?maximum permissible inflation pressure? on the tire sidewall. This number is the greatest amount of air pressure that should ever be put in the tire under normal driving conditions.
Do not exceed the wheel's maximum rated pressure. If the maximum pressure for the wheel prohibits the increase of air pressure, then maximum speed must be restricted to 65 mph (104 km/h).
The cold inflation pressure must not exceed 10 psi (69 kPa) beyond the inflation specified for the maximum load of the tire.
Increasing the inflation pressure by 10 psi (69 kPa) does not provide any additional load carrying capacity.