Tire Info From Prevost's Tech Online Manuals
I found this info this morning by searching Prevost's Online tech manuals in the "Wheels, Hubs, & Tires" section:
13.1 Recommended Tire Inflation Pressure (Cold)
Inflation pressure should be checked when tires are cold. Driving, even for a short distance, will cause the tire to warm up and the air pressure to
increase. Check inflation pressure on all tires using an accurate tire gauge.
The maximum loading tire inflation pressure (cold) for 12 R 22.5 tires are as follows:
Front axle....................................115 psi (792 kPa)
Drive axle......................................90 psi (620 kPa)
Tag axle ........................................95 psi (655 kPa)
Note: It is recommended that all tires on coach be of the same type.
Note: Tires are considered cold when the vehicle has not been driven for at least three hours, or driven less than 1 mile (1,6 km).
Driving, even for a short distance, causes tires to heat up and air pressure to increase.
Note: Never bleed air from hot tires as tires will then be underinflated. Use an accurate tire gauge to check pressures. (Do not kick tires as an inflation check. This is an unreliable method).
Caution: In the case of a converted vehicle, weigh vehicle fully loaded and pressurize according to tire manufacturer's recommendations.
Caution: These tire pressures are established in accordance with the maximum allowable load on each axle. A lower pressure is recommended if the axle load is less than the above specifications.
My tires are 315/80R22.5, so I guess the following would apply?:
RECOMMENDED TIRE INFLATION PRESSURE AT MAXIMUM LOAD (cold)
Tires 315/80R22.5
Front axle.............................................. .................................................. ............................100 psi (689 kPa)
Drive axle.............................................. .................................................. ..............................90 psi (620 kPa)
tag axle .................................................. .................................................. .............................80 psi (551 kPa)
Spare tire (if applicable)....................................... .................................................. ..............100 psi (689 kPa)
Caution: In the case of a converted vehicle, weigh it fully loaded and pressurize according to tire manufacturer's recommendations.
My guy at Apalachee RV reviewed all the information so far and recommends 120 psi in the steers and 110 psi on both the drives and the tags.
So many options, so many ways to screw this up! :confused: