i have some khumo r17 tires on my 89 rx7 convertable would anybody have a clue what psi i should have on them. the khumo site said set to mfg specs but its not standard size

 

looks like 32 psi is working good

 

the specs should be on the tires.
My Falkens say 44 Max..I run them at 42psi.
Under-inflation can kill a tire,so stick with the specs.

 

I think you should run the tyre pressure with the vehicle manufacturer especifications, and not with the tyre manufacturer especifications.

 

You should be running the recommended inflation that should be listed in your drivers side door jamb. Mine says 32 PSI, and 32 psi is 32 psi no matter what size tires you are running. To the other guy who runs his at 42 psi, I wouldn't recommend that. The ride is going to be really harsh, and you can lose control much easier.

 

The two above posts are correct, start with 32psi. If you notice abnormal wear or if you want to tune the ride for autocross events then you can try increasing or decreasing by about 2 psi and see how that works, but you should generally stick with the recommended pressure as per the door jam sticker. The max pressure shown on the sidewall will be too high for optimal performance and will cause excess wear in the center of the tire tread.

 

Excellent diagram. Not only that, but everyone knows that air expands with heat. Typically I see a 7-8 psi increase in mine after the tires are warmed up which means if dude is running 42psi cold, he could be running up to 50 psi at operating temp. Bad news there.

 

ya 32psi seems to be b workin fine thanks

 

32s just right thanks