There are quite a few potholes and such around where I live and was wondering what a good PSI is to keep my 20" tires. Should the rears be 2 psi higher than the fronts? I just saw a couple of threads about this and didn't really understand why.. also, I've never personally put air in my own tires so should I ask someone for help when I go to a filling station? I read on the tires that it says max psi 50, but it says never exceed 40 psi.. I think the fronts are at 36 right now and im not sure about the rears

I run 32psi in my 17s all around. 36 probably will do for all four tires. Filling a tire will air is probably the simplest thing you can do in owning a car. Just get a 12v car air compressor from sears or wherever and a digital tire pressure gauge. That should only set you back 40 bucks total.

can't i just go to a filling station or w/e and use theirs? do they charge you to use their air :P. my friend's got an air compressor for like painting and stuff but would that work for filling up my tires?

I would run the max recommended pressure. On my last car, I ran 50 psi all around.

Run what is listed on your door

I use 40, much higher and the ride gets really rough. Even at that, I managed to bend my rear on a pothole, and thats on a forged DPE. my advice is to avoid the pot holes at all possible costs. No matter what pressure you use a 35 series does not offer much if any rim protection.

Call your tire company and they will calculate the load index's compared to the oem tires and give you new psi. I bought Yokohama s drives for my 20s and they gave me 39 front and 37 rear. IT DOES NOT GO BY YOUR DOOR. DIFFERENT TIRES HAVE DIFFERENT LOAD INDEX'S!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!