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Minimum Tire Pressure on motorhome
Posted by Joel from Barberton, OH, US on June 3, 2009
On 36 ft. Holiday Rambler class A motorhome, the Sumitomo tires show maximum cold air pressure of 110 PSI. ( 245/75R 22.5) on the sidewalls. Checked air pressure. It’s 91.5 on fronts and 86 0n rear (duals, not tag axels). What is the correct or best pressure I should set them at?
The correct pressure depends on the load you are carrying. You need to have the motorhome weighed by axle to make this determination. Weigh the motorhome when it is loaded as it would normally be when you are traveling. Divide the axle weights by the number of tires on the respective axle. In your case, divide by 2 for the steer axle and 4 for the drive axle. Then use the published load/inflation charts for the 245/75R22.5. In your case, you should find these on the Sumitomo website or by contacting a Sumitomo dealer.