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Old 11-20-2015, 07:33 PM   #1
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Tire pressures on 45' coach

The plaque in the coach recommend 100# front tires and 85# in rear and tag tires. But a tire repair guy recommended that we use 120# on all tires. I know some of you guys have weighed your rigs, which I haven't done yet, and have adjusted accordingly. What has been your experience with the pressures. I try to balance out the load in the storage bays. Any information would be appreciated.

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Old 11-20-2015, 08:03 PM   #2
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The tire placard is the recommended air pressure by the coach manufacturer for it's maximum weight=GVWR.
The Tire and Rubber Association (pg 51) agrees with that and recommends never using less pressure, regardless of weight/inflation charts, and of course, never exceeding tire sidewall listed pressure.

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Old 11-20-2015, 09:07 PM   #3
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Weigh your coach first at any truck stop. It is very easy. I just weighed ours and it fits on the 3 scales just fine. Get your 3 axle weights then adjust the tire pressure based on the tire manufacturers chart. Very easy.
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Old 11-21-2015, 06:19 AM   #4
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That tire guy is full of horse puckey - ignore him. The placard recommendation is very conservative, i.e. errs of the side of safety, and quite likely is more than is actually needed for your real loaded weight. Increasing 20 psi above that is more likely to result in problems than to benefit in any way. Potential problems from over-inflation include "squirrelly" steering, rough ride, and loss of traction on wet roads.

Get the rig weighed (at least axle-by-axle) at your earliest convenience, so you will know what psi is actually needed for your loaded weight.
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Old 11-23-2015, 05:56 AM   #5
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What Gary said...plus if you ever get the chance (a rally is a good place) have each wheel weighed. That's the only way to get all the information you need to air up your tires accurately.
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Old 11-23-2015, 06:45 AM   #6
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Agree, the placard is for the MAXIMUM weight for the coach.... and a safe place to start until you get it weighed.

if you are not carrying the maximum weight for the coach,
why would you need the maximum psi?

as suggested, go to a cat scale found here, take 10 minutes and $10 or so to get your axle weights... (loaded for a trip with full fuel tank)

then do a google search for your tires load inflation tables to see what psi is needed for your actual weights...

Here's goodyear's.

Here's michelin's.

Also, if you substantially change the way you load the front versus the back,
you might spend another $10 to weigh again

good luck!
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Old 11-26-2015, 08:12 AM   #7
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My experience as a new guy five years ago. Mounted brand new tires and filled all to 120 psi. The ride was like the Flintstone car. I hit a pothole on I-64 and the right front tire nearly grenaded. Had to replace with new tire. Ouch.

After that, I had coach weighed at four corners. Front psi dropped to 100 and rears to 90. What a difference!

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