Community Forums

1kingtut · 08-13-2012, 12:48 PM

OK here we go, I have looked at alot of the threads on tire inflation and they make sense to me kinda. I look at the chart for my Michelin tires and the chart is telling me one thing but in reading the forum is telling me another.

Some info:
Front axle GAWR 15,160
Rear axle GAWR 20,000
Tag axle GAWR 10,000
Driver Pass Tire:Michelin XZA2 Energy

Front axle weight 14,520 7,160 7,360 315x80x22.5

Drive axle weight 18,300 8,920 9,380 295x80x22.5

Tag axle weight 6,660 3,240 3,420 295x80x22.5

The chart for the front is 7,190lbs is 100psi and 7440lbs is 105psi single tire so I have 105 for front is this right or should it be 100 as 105 is "maximum" cold pressure.

Now the confusing part for me: chart says "Dual means an axle with two tires mounted on each end" and the inflation table starts at 9530 lbs at 75psi should this be my pressure for the drive axle and tag at also at 75psi.

Mr_D · 08-13-2012, 01:03 PM

The pressures on the sidewalls and charts for truck/MH tires is the MINIMUM cold pressure required to support the weight given.

You go by the heaviest end of an axle and run the same pressure across that axle.

Never go below the minimum pressure on a chart for your tires.

All of the above is in the Michelin (and other brands as well) RV Tire guide. Most of them are online (I know Michelins is) and are good reading.

1kingtut · 08-13-2012, 01:24 PM

Yes I understand to use the same pressure for both sides my question is on the table for Michelin am I understanding thier guide right as the 75 lbs for my axle wieghts (drive/tag) is the minimum.

Midniteoyl · 08-13-2012, 02:03 PM

Quote:

Originally Posted by 1kingtut

The chart for the front is 7,190lbs is 100psi and 7440lbs is 105psi single tire so I have 105 for front is this right or should it be 100 as 105 is "maximum" cold pressure.

Now the confusing part for me: chart says "Dual means an axle with two tires mounted on each end" and the inflation table starts at 9530 lbs at 75psi should this be my pressure for the drive axle and tag at also at 75psi.

Yes.. run 105 in the front, 75 in the rear..

Provided, of course, that this is the LOADED weight. if not, you need to have full fuel, water, propane, food, stuff, cloths, etc in the coach and re-weigh.. And, you just might wanna think about loading more weight to the rear than the front.