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Old 04-09-2015, 08:29 AM   #1
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Tire Pressure

Fellow Greyhawk owner- what tire pressure do you use in front and rear? I know our door post says to use 75psi front and 80 psi rear. We have the original Mich LT X MS2. / 225/75R/16 E tires . There is so much discussion about load tables, but the only one I could find was in the Mich truck book @ page 21. I don't see any variation in suggested psi.

Anyone with more experience.
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Old 04-09-2015, 08:32 AM   #2
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If it is the OE tires, same load range, I would go with the door post recommendation.
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Old 04-09-2015, 01:56 PM   #3
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80 Rear, 76 Front. 80 is the max cold pressure for Michelin LTX MS2.
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Old 04-09-2015, 03:23 PM   #4
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Best is to use the same sises pressure loadcapacity lists from European sites, because they are calculated with saver formula then American lists.
American TRA swiched over to this European ETRTO calculation as late as 2006 , but only for P-tires and XL/reinforced/Extraload tires ( most for normal cars used).
TRA left the calculation for C-load and up to the old calculation wich gives to high loadcapacity in the lower pressures.

Beter would be to give me the GAWR/GVWR ( gross axle/vehicle weigth rating) or beter even weighed seperate wheel or axle loads.
And maximum speed you wont go over for even a minute.
Then number of tires and axles behind ( front will be 1 axle with 2 tires )

then from tires 1. Maximum load or loadindex, 2 AT-pressure or loadrange, 3 maximum speed of tire or speedcode letter ( probably N for up to 140km/87m/h) . Can be found on sidewall.
I already googled yoru tires to be LI 115 with maximum load 2680lbs AT 89 psi with speedcode R.

So only need specifications of motorhome

will give picture of my made extra save pressure loadcapacity list in front .
used it in other forum so disrecard the highlited 119 LI and use the top line with LI 115.
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Old 04-09-2015, 04:35 PM   #5
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The best thing to do is have it weighed and then adjust the pressures according to Michelin's inflation tables.

Load & Inflation Tables | Michelin Truck
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Old 04-09-2015, 06:08 PM   #6
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I would look at the outside Temp while on a long trip. On a hot day I would take air out. Cold day you are ok with those #'s.
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Old 04-09-2015, 06:19 PM   #7
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75 front and 80 for the rear.
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Old 04-09-2015, 08:27 PM   #8
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Way too much info here. I go by the door tag which coincides with the weight of my rv.

Tire Guide, Warranties & Bulletins | Michelin RV Tires
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Old 04-10-2015, 06:38 AM   #9
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Quote:
Originally Posted by hoppers4 View Post
Way too much info here. I go by the door tag which coincides with the weight of my rv.

Tire Guide, Warranties & Bulletins | Michelin RV Tires

That is the correct way to go!
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