Reply
 
Thread Tools Display Modes
Old 11-27-2018, 10:24 AM   #1
Junior Member
 
Join Date: Oct 2018
Location: Denver
Posts: 6
Send a message via MSN to Denver Dan
Tire inflation pressure

After driving my 2017 Coachmen Prism about 10K miles I noticed that the outside shoulders of the front tires were wearing down rather quickly. When I dropped the unit off at a local Mercedes dealer for its annual maintenance I asked about the wear. The service manager told me that it was caused by improper alignment triggered by adding the weight of the coach onto the chassis. He implied that the alignment issue should have been addressed by the coach manufacturer, and he recommended a local tire shop to get the alignment corrected.

I took the unit to the recommended tire shop for alignment. When I picked it up the tire man told me that the issue wasn't the alignment, but was rather caused by underinflated tires. I had been running the tires at 61 psi (as per the tire pressure sticker on the door frame) but the tire man said that figure doesn't take into account the weight of the coach and I should be running the front tires at 70 psi and the rear tires at 75 psi.

I've taken the tire man's advice and increased the pressure according to his recommendations, but I'm curious about the validity of the advice I'm getting from the 'experts'. The owners manual for the motorhome states that the tires should be set to the pressure shown on the door frame sticker.

So, what's the best/most correct advice on tire inflation pressures for class C motorhomes? I'm confident that readers of this forum will be ready, willing and able to offer their opinions...
__________________

__________________
Dan
2017 Coachmen Prism 2250LE
2017 Toyota Corolla
Denver Dan is offline   Reply With Quote
Old 11-27-2018, 10:50 AM   #2
Senior Member
 
Chuck_S's Avatar
 
Join Date: Aug 2018
Location: Richmond VA
Posts: 904
Motorhomes of any size are still motor vehicles and have the same tire wear issues and patterns of all motor vehicles. Wear on both edges is under-inflation.

If the door jamb cold tire pressure specification isn't sufficient boost it by (say) 5 psi. There's usually plenty of room under the maximum sidewall pressure as listed on the sidewall.

Check the cold tire pressure every morning the vehicle moves until you're confident the tires and wheels are maintaining pressure.



-- Chuck
__________________

Chuck_S is offline   Reply With Quote
Old 11-27-2018, 11:16 AM   #3
llr
Senior Member
 
Join Date: Feb 2017
Location: SW Ohio
Posts: 899
take it to a scale and get the actual weights then use the load inflation tables to get the proper pressure
__________________
TT 2017 Flagstaff 831CLBSS Classic Ultra lite
TV 2014 Silverado 2500 HD
llr is offline   Reply With Quote
Old 01-02-2019, 08:57 AM   #4
Junior Member
 
Join Date: Oct 2018
Posts: 4
Wear on both the inside and outside edges would indicate under inflation. Wear just on the outside edges of both tires on the same axle would indicate an alignment issue.

Edit - updated after I realized that this is not a tow able - same general rules apply though.
eflyersteve is offline   Reply With Quote
Reply

Tags
pressure, tire

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



» Featured Campgrounds

Reviews provided by


Disclaimer:

This website is not affiliated with or endorsed by Forest River, Inc. or any of its affiliates. This is an independent, unofficial site.




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 02:20 PM.