PSI for XRV's on W22

[Rolling on W22]

Hello everyone,

I just wanted to confirm the correct PSI for the W22 standard (7500 front 14,500 rear) with XRV's 235/80/22.5 is 90 psi front, 90 psi rear.

Thanks, and I look forward to learning more in the future.

[Rolling on W22]

Hello everyone,

I just wanted to confirm the correct PSI for the W22 standard (7500 front 14,500 rear) with XRV's 235/80/22.5 is 90 psi front, 90 psi rear.

Thanks, and I look forward to learning more in the future.

[Rolling on W22]

Forgot to add, my tires have sidewall marking of 110 psi max pressure.

[edgray]

Rolling: the axle weight ratings are not the proper way to determine what your pressures should be set. You need to get the weight of your coach, loaded as you typically use it, and then set your pressure according to the Michlin charts for your tire size. If you can't get four corner weights, then at least get individual axle weights.

[Rolling on W22]

I definately will get the rig weighed when loaded, and with full fuel and water. Just FYI on the workhorse chassis guide downloaded from this website, page 36 says the "minimum" recommended psi is 90. Using the Michelin tire load inflation chart 90 would be the "maximum", because if you needed more than 90 that axle would be overloaded.

Anyone here run "less than" 90 psi on their W22 with XRV's in my size?
Thanks

[oemtech]

Yep - According to my wheel weights and Michelin load rates I run 90 in the fronts and 85 in the rears. This is based on the heaviest corner weight corner per axle with 500 lbs added to that weight.

Example - RF = 3400+500=3900lbs - 90 psi
LR = 6600+500=7100lbs - 85 psi

[LeeB]

I run 90 in the front and 95 in the back. I have not had my coach weighed. However I just got new Tires and the gentelmen that did the install has installed many RV tires in the past years. I asked him what I should run. He asked me if I was a full timer and I told him no. He then kinda sized up what my use was and he told me to run 90 and 95. Until I weighed and got better information.

Hope this helps you Lee

[Trek-Cyclist]

You need to take the guess work out of tire inflation. I wouldn't take what anyone/someone says you should have for pressure in "your" coach. It's nothing more then a guess. A blowout at 60 to 70 mph can cause more damage to your coach then the tires are worth, never mind losing control!
If you can't get all four corners weighed at least get the front and rear weighed and inflate your tires according to the Tire Manufacturers inflation chart.
No one can kinda size up your load use and tire pressures. The keyword is KINDA......?( Guess )

[Rocky 2]

LeeB, you can get your coach weighed all four corners at the Escapee Rally in Stockton April 23-27. They do the weighing on the getaway day. In the past, it has been priced at $49. It only takes a few minutes to do the weighing and they will give you a written report (and the tire guide).

[YosemiteBobR]

Just go on the Internet and find a cat scale near you and/or a public scale. They will accommodate you pretty well. My neighbor scale will do single tires, axle, side to side, and full and they only charge $8.00.

[DriVer]

According to the weights I received on a CAT scale the best weights for me are 95 Front and 90 Rear.

Do I need that much pressure to accomodate the measured load? Answer is no.

The caveat is that +5 psi per tire adds a margin of safety above the minimum inflation pressure for the maximum load.

I have the optional axles 8.5K(F) and 15K(R). Adding both axle ratings yields 23.5K worth of axles however the vehicle is only rated for 22K.

[abarkl]

[QUOTE]Originally posted by DriVer:
The caveat is that +5 psi per tire adds a margin of safety above the minimum inflation pressure for the maximum load.
QUOTE]

So it's your opinion that +5 psi adds a margin of safety?

[DriVer]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by abarkl:
So it's your opinion that +5 psi adds a margin of safety? </div></BLOCKQUOTE>Not exactly my opinion more the tire manufacturers. +5 psi buys you time. If your tires become underinflated, below the recommended inflation pressure, damage or failure can result.

If you check your pressures routinely you might find them to be all 2 to 3 pounds low but not below the minimums.

[abarkl]

I run mine at the chassis manufacture's recommended pressure (or as close as possibly) to the sticker 'on the door' of 90 in the front and 85 in the rear.