Reply
 
Thread Tools Display Modes
Old 05-23-2011, 04:30 PM   #1
Senior Member
 
Join Date: Sep 2010
Posts: 101
Tire inflation question

My 2011 Sunseeker (E350 super duty chassis) is equipped with Michelin LT225/75R16E tires. I recently had the motor home weighed fully-loaded for travel.

Combined front axle weight = 3,660 lb. (Front GAWR = 4,600 lb.)
Combined vehicle weight = 10,760 lb. (GVWR = 12,500 lb.)
Combined rear axle weight = 7,160 lb. (Rear GAWR = 8500 lb.)

I am not sure I am using the Michelin inflation chart (Google: "Michelin Inflation Charts for RV Usage Only") correctly to determine what the proper tire pressure should be. I assume that to estimate the single-tire value on the chart I should divide the combined axle weight by two. Thus, for the front tires, the value would be 1830 lb. (This, of course, assumes equal weight distribution on each tire.) If that is correct, then the recommended inflation pressure is about 46 psi. Using this same method, the recommended inflation pressure for the rear duals is about 51 psi.

As received from the dealer, all the tires are inflated to the maximum pressure listed on the tire of 80 psi. (The sticker on the door lists 65 psi.)

Are these tires seriously overinflated or do I just not understand how to use the Michelin inflation chart correctly?
__________________

__________________
Al Fresco is offline   Reply With Quote
Old 05-23-2011, 06:14 PM   #2
Senior Member
 
Join Date: Aug 2010
Posts: 855
Inflate ALL tires to the maximum pressure as listed on the tires sidewall. It might make for a bit harsher ride, but your tires will thank you at the end of a hot day.
__________________

__________________
donn is offline   Reply With Quote
Old 05-23-2011, 10:52 PM   #3
Senior Member
 
Join Date: Sep 2010
Posts: 101
Thanks for the expert advice. Looks like the dealer didnít overinflate after all.

Is there any valid reason why Michelin (and whoever placed the sticker on the chassis door) recommends inflation pressures that are so much lower than the maximum listed on the sidewall?
__________________
Al Fresco is offline   Reply With Quote
Old 05-24-2011, 12:08 AM   #4
Senior Member
 
papap's Avatar
 
Join Date: Apr 2011
Location: Southwest Louisiana
Posts: 729
just bought a 2011 Solera and wondering the same thing now. Have not checked the pressure yet. But getting ready to make a 1700 mile trip and will check them before we leave for trip.
__________________
2016 Forester 3171DS
Work 28 and 28 around the world.
Camp every chance we get

papap is offline   Reply With Quote
Old 05-24-2011, 08:36 AM   #5
Senior Member
 
Join Date: Aug 2010
Posts: 855
Same as the sticker on every vehicle built. It is a compromise number to give a soft ride. It you look at the tire sidewall there is an inflation number that gives the load rating for that tire at that pressure.
__________________
donn is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



» Virginia Campgrounds

Reviews provided by




ForestRiverForums.com is not in any way associated with Forest River, Inc. or its associated RV manufacturing divisions.


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 04:05 PM.