looking for some advice. i run my factory hankook 275/55/20's at 35psi cold. however, i do about 90 percent hwy driving and that psi increases quite a bit as they warm up. as a result, i can notice the center of the tire is showing a little more wear than the sides indicating over inflation.

do you think i should run a little less psi to take into consideration the increased psi as they warm?

the outside temp here can vary anywhere from -40 to almost +40

thanks

 

Drop it to 32 and try. But remember when using it as a truck to properly in flat them.

 

What's quite a bit? What psi are they when hot.

 

When running lightly loaded the weight distribution is around 60/40 front/rear. At factory pressure the fronts are probably under inflated and rears over inflated. Both can't be right because the fronts are carrying much more weight and the tire size is the same front to rear.

3 - 5 PSI increase in tire pressure from cold to warm is normal and factory tire pressure has this built in. I run my 265/70 - 17s 40/30 and after about 11,000 miles have even tire wear.

 

I have OEM GY 20's and run 43/42 cold F/R with 15K on the clock. Tires look great, no wear noticed at all. Mine go to 46/45 when warm or after being driven at highway speeds.

 

I'd check the gauge your'e using, 'cuz there's no way 35psi will cause premature center wear.
With air, your tires will gain around 5-7psi when warm(rule of thumb is 3-5 with less weight, 5-7 more weight/drive tires), unless you're running too low or too high pressure.
You can also use nitrogen which doesn't hold moisture like air does, so its gain is more linear and less erratic.
Average drivers usually don't notice the difference though.
IMO, with the cost difference in using N2 vs. air, you're better off just spending your money on a good/accurate gauge

 

I have the OEM 275/55/20 Hankook Dynapro and feel that 32 PSI (cold) is the best place for the all terrain tire and the pressure increases to 35 to 36 PSI when driving. As stated above, when hauling a heavy load or towing, raise the pressure up to 35 - 40 PSI.

Note: When I am running an all-season radial with a less aggressive tread pattern, 35 PSI has typically been the sweet spot for those tires, but I have not tried that kind of a tire on this truck.

 

The cold inflation pressure is just that. Cold, as when it has been driven yet in the morning. The pressure is expected and supposed to rise when you drive, the faster you go, the higher it rises. Guess what, that's the idea. No need to try to aim for 35 at speed by underinflating cold.

 

I run my 18" hankook's at 41PSI cold