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Old 08-19-2014, 10:14 AM   #1
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Tire Pressures

I know that tire pressure questions have been beat to death, but I have another. I have Michelin XRV 235/80r22.5 tires on a Coachmen DP. I have axle weights of 8440 steer and 13500 drive. I haven't been able to secure individual weights. Using Michelin charts (which are for individual weights) my tires should be 95-100 psi in front and 75 - 80 psi in rear. I called C/S at Michelin ( to confirm because I thought rear was low for dual tires) they say that since I can't get individual weights I should go with max of 110 psi all the around. Would love some opinions and suggestions. I currently run at 90 psi on all 6 tires.

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Old 08-19-2014, 10:31 AM   #2
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80 psi. rear would scare the h... out of me , stick with 90 there.
I would put the front to 95 though, and be searching for a spot to get the corner weights.
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Old 08-19-2014, 12:16 PM   #3
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Quote:
Originally Posted by Skip426 View Post
80 psi. rear would scare the h... out of me , stick with 90 there.....
I'm in agreement with Skip on the 80. Sounds like a problem waiting to happen. I'm running 95 on the rear and 90 on the front Tried 95 on the front when I got the unit as that was the pressure in them, but noticed too much steering wander, so dropped a couple of PSI at a time until the front end felt more stable.
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Old 08-19-2014, 12:34 PM   #4
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Under inflation is a mistake, over inflation as long as it does not exceed the capacity of the tire can be uncomfortable but is using the tire as designed. So if in doubt add some air. IMHO
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Old 08-20-2014, 11:20 AM   #5
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As long as you don't go below the minimum inflation in the tire tables, you really don't have to worry about the 80 psi. However, since you never, ever, want to be low, going 10 psi above the recommended value is a safe bet.

When using the axle weight instead of individual weights, you need to make an allowance for possible imbalance on the axle, i.e. one end heavier than the other. I would add 10% for that. On the rear axle, divide axle weight by 4 and then add 10%, using that value of the estimated tire weight in the tire tables. And maybe still use an extra 5 psi after selecting that.
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Old 08-20-2014, 11:40 AM   #6
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You may not need max air but low air builds heat and heat kills tires.
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Old 08-24-2014, 08:33 AM   #7
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Thanks all for the help. Until I can get corner weights I'll run 90 in rear and 95 in front and see how it rides. Maybe there will be an option for corner weights at at an iRV2 rally in the future.
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