We know that all four tires should have the same PSI when cold. But, what about after spending two hours on the blacktop during the Summer?

The fronts should run a lot hotter than the rears given their proximity to the engine, the much greater load placed on them because of the weight distribution, and the greater amount of work that they do (turning, etc.) than the rear.

Yet, I rarely see any suggested pressures for them when they are running hot.

From what I have measured, they seem to run 1 to 1.5 PSI higher than the rears when hot after both were set to equal amounts when cold.

The reason I mentioned this is because I recently had a slow leak in both front tires, and I needed to keep them inflated to specs until I could get them fixed.

In this case, "specs" would not be "same as rears" because I had been on the highway for two hours. So, using past experience as a guide, I inflated them to 1.5 PSI higher than the rears.

Comments?

 

Sounds right. 1-1.5 PSI won't hurt you anyway, as long as you don't overinflate.

 

In general; yes you are right both front and rear should have the same PSI, but in practice, its easy to see that the rear tires may be inflated to a lower pressure then the rear. this will give you better control when cornering hard.

i dont know what kind of tires and rims you got, but if speaking of stock, i like to keep the front PSI at 35 and the rear anywhere from 30-35.

Also watch your tread wear. if its uneven then the pressure must be adjusted accordingly.