Quote:
Originally Posted by srobm
I did that also. Started at 80 pounds then went to the Thor's recommendation of 90 pounds. As I said the right front tire was totally gone at 13,000 miles from not being aligned properly and the left one was almost there with definite signs of under inflation. The tire shop said for the 19.5" tires you need to be over 100 pounds. Running mine at 110 now (maximum pressure for the tire is 120 pounds) and the motorhome drives down the road like a different unit.
|
I assume you had it aligned as well... and would guess that has a lot more to do with the current 'drive down the road'...
Running at the MH placard pressure is 'safe' - it is calculated assuming max weight... Assumes of course that you are at or below the max weight!
Running less than that should be based on the ACTUAL axle weight of your rig loaded for travel (people, cargo, fluids) and the tire manufacturers charts. Running less than required for the actual weight certainly risks damage from under inflation...
Running at the tire's maximum - above the MH placard is not a recommendation I have seen... I expect a harsher ride at least. Less road contact - more likely to hydroplane, extended braking...
From one tire store:
Quote:
What happens if you inflate your tires to the max PSI? - The handling characteristics change
Since tires inflated to the max can’t give as much on the sidewall, you might see superior cornering, but it could be at the risk of your braking threshold. One quick corner and your back end could slide out.
- The life of your tire decreases. When your tires are inflated too much, the rubber rounds out at the top of the tire when you’re driving, and the center will quickly wear out. You’ll also reduce your traction and you could even cause a blowout.
|
Thor Forums
