Skip to main content ↑ ↓
Topic: Tire Pressure Again (Read 599 times) previous topic - next topic

Tire Pressure Again

We have weighed our motorcoach but were only able to weigh the front and real axles, not the individual tire weights. The question is, how much do forum members compensate for not knowing the individual tire weights?. Thanks. Larry
Larry and Terry
Ex 2004 U270 36'

Re: Tire Pressure Again

Reply #1 –
We run max cold tire pressure all the way around as indicated on the tire sidewall. 110 psi with the tires we have now. Also never adjust pressure in hot weather even in summer in Death Valley

Pierce
Pierce and Gaylie Stewart
'93 U300/36 WTBI
Detroit 6V-92TA Jake
1140 watts on the roof
SBFD (ret)

Re: Tire Pressure Again

Reply #2 –
Quote from: Pierce & Gaylie Stewart –
We run max cold tire pressure all the way around as indicated on the tire sidewall. 110 psi with the tires we have now. Also never adjust pressure in hot weather even in summer in Death Valley

Pierce

Max sidewall pressure causes several issues if not the actual load the tire is carrying.

Noticeable feedback from sharp road hits like expansion joints and you are running on the center of the tire more than the edges. 

Not full contact.  The max pressure is for that exact max load on the sidewall. 

Bob
"Riding and rejoicing"
Bob
1997 U320 40' Mid entry, build 5132,  wtbi ce27, 4th owner
2007 Solara convertible
2 prodeco tech outlaw ss electric bikes

1095 watts solar
08 Ls 460 and a sc430
2000 Ford F-250 superduty 4x4

Re: Tire Pressure Again

Reply #3 –
The recommended method is ,for example,  the front axle: Divide axle weight by 2 to get the two tire weights and then add an estimate for the side-to-side weight difference. You should be safe adding 500 lbs for the front axle - then use the tire inflation table to get the correct inflation for the load. By the way, my single slide U320 had no significant side-to-side difference on the front axle, but the passenger rear side was +900 lbs compared to the left. I'll bet others with the same coach as yours can give you numbers based on their individual wheel position weights.
Jeff & Patricia
Rescue dog Molly
Previous Foretravel owner

Re: Tire Pressure Again

Reply #4 –
Assuming you don't exceed the tire or rim PSI maximums, add 5 PSI for side to side imbalance and 5 PSI for a safety reserve= 10 PSI.

Brett
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020
 

Re: Tire Pressure Again

Reply #5 –
Thanks for the replies. I am going with Brett's example of adding 10 psi to each tire. By the way, adding 500 pounds to the front tires and 900 pounds to the rear tires to compensate for only weighing the axles as suggested by Jeff resulted in adding the same 10 psi to each tire. Larry
Larry and Terry
Ex 2004 U270 36'