tire pressure
2005 Winnebago Adventurer w/ Michelin 235/80 R22.5 tires. What tire pressure is recommended for a fully loaded motorhome? I have had several "suggestions" from RV repair facilities.
Forum Discussion
Best is still to do 4 point weighing and add up to 10% to the weighed loads. Then look the needed pressure up in my made lists.
Or use my made motorhomeRV calculator.
There in part 3 you can give wheel(pair) weights and in part 2 axle weights.
Part one is to give tires and vehicle data .
The tire is allowed higher warm pressure then the given "maximum" pressure wich is in fact not even the maximum pressure , most tire makers allow 10 psi higher . So warm it can even get 30% higher then AT-pressure. So asuming the tire must not get over AT-pressure is wrong.
If you have TMPS you better switch to temperature given, and keep the warm inside tire temp about 110 to 115 degr F when driving 60m/h and no external heating like severe braking or sunshine .
Then the pressure will rise about 10% so 90 becomes 99 ( so 115 given is to high) but tombarbs given 97 becomes 105 is still about right because 97+10%$=106.7.
Or use my made motorhomeRV calculator.
There in part 3 you can give wheel(pair) weights and in part 2 axle weights.
Part one is to give tires and vehicle data .
The tire is allowed higher warm pressure then the given "maximum" pressure wich is in fact not even the maximum pressure , most tire makers allow 10 psi higher . So warm it can even get 30% higher then AT-pressure. So asuming the tire must not get over AT-pressure is wrong.
If you have TMPS you better switch to temperature given, and keep the warm inside tire temp about 110 to 115 degr F when driving 60m/h and no external heating like severe braking or sunshine .
Then the pressure will rise about 10% so 90 becomes 99 ( so 115 given is to high) but tombarbs given 97 becomes 105 is still about right because 97+10%$=106.7.
