got_root?

I just got new wheels and tires. My previous tires were S-02 225/45/17 and the new ones are S-03 225/40/18. I liked my 17" tire pressure at 38psi. Does 38psi on 17" equal 38psi on 18"? In other words, should I inflate the new tires the same as the old or is it different?

thanks... josh

jatea4

I imagine that whatever readout you get from your tire pressure gauge, is the same measurement of lb/ sq in, ft whatever it is. In otherwords, although there may be more air in a tire, that is 18" as opposed to 17", the pressure exerted is the same.

I'm running 36 on 15". I did ride on 38 before, but my suspension isnt that great and I could really feel it. My suggestion would be to experiment a little bit with a little less pressure..i.e. 36 and then go up if needed.

Hope that helps.

RedBlackYellow

but since you say your tires are less profile with the same width, i'd got maybe 36 psi instead of 38. Like jatea4 said, just try it out I noticed a huge difference in my car with 225/45/17 going from 36 to 38.