Tire Pressure

ken07734 wrote:
Ok, the sticker on the side of my TT states the tires should be filled to 50 psi. Every time I take it to the dealer I get it back with over 70 lbs psi in the tires. Anyone have this happen to them on their rigs? When they fill them that much the trailer bounces all over the place when I hit any bumps or potholes. I drove it down to Florida and back with them at 50 psi and I a smooth ride the whole way. Am I missing something?

This is just another example of people who think they are experts, but aren't. You don't have to go very far to find people like that - and tire threads seem to attract them.

I'm not getting why the tires would be filled past what the manufacturer requires. On my Truck it says 35 all around, I fill it 35 all around and the tire light stays off.

Tires on the trailer are close together and in the center of the vehicle and operate in a much different/tougher environment than tires on a truck which the front set turn/steer and the rear set simply follows through the corner.

Tire on the trailer slide sideways (side scrubbing) as its pulled around the corner. This action is very hard on any tire and can and has separated the tires internal belts especially with less than max pressures. Max pressures simply help hold the tires shape/internals together as its scrubbing around the corner or helps keep the rim lip from cutting a tires sidewall as it rolls over a curbs or any obstacle. And they roll easier (less parasitic drag) which helps the truck with a small block gas engine pull the trailer easier.

Carlisle and Goodyear both recommend sidewall max pressures. If fact its part of Carlisle tire warranty requirements.

My wifes 1500 crew cab 4x4 chevy truck recommends 35 psi in P265/70-17 tires. I find that 35 psi works great in the rear and 40 in the front works best when empty.
But after loading the truck with a 7500 lb trailer with 1000 lbs of hitch weight max sidewall 44 psi in the rears works best on her truck. The tires roll easier plus they aren't squashed looking and they don't exhibit carcass roll like 35 psi allows.

ken07734 wrote:
Well, the tires came with the trailer when I bought it and the trailer is new. I assume (and I will double check) that the manufacturer would not install tires that are outside the specs of what is stickered to the side of the trailer. I always check them cold and I have used several gauges to make sure they are correct. The sticker says to fill max to 50 psi. I found (cold) that the tires were at 70 all around. I'm not getting why the tires would be filled past what the manufacturer requires. On my Truck it says 35 all around, I fill it 35 all around and the tire light stays off.

Don't forget to check the rims too. Trailer rims also have a max pressure rating stamped on them. Check both sides of the rim. The techs at the dealership may be identifying the rims on sight (which could be a higher rating) and never looked at the max tire pressure rating.

x

forget the sticker. Go by what it says on the sidewall, period.

ken07734 wrote:
Well, the tires came with the trailer when I bought it and the trailer is new. I assume (and I will double check) that the manufacturer would not install tires that are outside the specs of what is stickered to the side of the trailer. I always check them cold and I have used several gauges to make sure they are correct. The sticker says to fill max to 50 psi. I found (cold) that the tires were at 70 all around. I'm not getting why the tires would be filled past what the manufacturer requires. On my Truck it says 35 all around, I fill it 35 all around and the tire light stays off.

Tire guy didn't check....just aired them up
Sticker says 50# MAX then that is what YOU need to tell the tire guys.
Always inform the tire guy what pressures you want. They do hundreds/thousands of tires and don't always know what should be used and don't have time to check.
It's your rig..tell them 50PSI MAX. End of problem.

My tires are 110# MAX..I run them at 105#.
When getting new tires I tell them 105# and then I check pressures before moving rig.
If they aren't at 105# I get them to correct it.....before I pay :B

Well, the tires came with the trailer when I bought it and the trailer is new. I assume (and I will double check) that the manufacturer would not install tires that are outside the specs of what is stickered to the side of the trailer. I always check them cold and I have used several gauges to make sure they are correct. The sticker says to fill max to 50 psi. I found (cold) that the tires were at 70 all around. I'm not getting why the tires would be filled past what the manufacturer requires. On my Truck it says 35 all around, I fill it 35 all around and the tire light stays off.

Be sure that you are checking the pressure with the tires cold. Also, double check your gauge against a known good one.

I find it nearly impossible to get quality work done anymore. I took my truck to the dealer for a balance issue and they left air out of the tires. It was nearly 100 degrees and the tires were hotter yet. When they cooled the pressure was 8 lb too low.

ken07734 wrote:
Ok, the sticker on the side of my TT states the tires should be filled to 50 psi. Every time I take it to the dealer I get it back with over 70 lbs psi in the tires.

Ken

Tires are to be inflated to the maximum pressure that it says on the tire. If someone at the dealer is inflating it to some other pressure, bring it to their attention and tell them that you want it to the pressure stated on the tire, and that they are not to mess with your pressures.

Of course this is all assuming that you have the correct tires on the trailer in the first place. By correct I mean tires with the correct load capacity at that maximum pressure to suit the actual weight of your RV or the trailer GWVR, whichever is greater.

Check you tire side wall. It will tell you the max on there. Run it. I'm betting it is 50 psi