So I'm going to find out how dumb of a question this is very soon... but here it goes!

How do I find out the optimum tire pressure for my new rims and tires? 19" rims 8.5 and 9.5 rear. The tires are 245/40 and 275/35.

Thanks... If this is really a dumb question, feel free to bash... only after you answer though

 

It is probably important what your goal is for optimum tire pressure, straight line traction, cornering, fuel effieciency, comfort, something else. Most likely with that low of a tire profile there probably wont be much difference. I would suggest starting with standard tire pressure (33psi F&R I think) and adjust from there.... there are a couple of tricks we can help with if you are going for straight line traction or cornering, but they'll only make much difference on the track. For a daily driver you are probably going for comfort, while trying to avoid wheel/tire damage.

 

Cool, thanks... wasn't sure if it changed at all even though it is pressure measurement.

 

Well ... I was gonna say you can't go less because of the TPMS, but since you don't have them in there ....

More than likely, you'll need to run higher pressures. You should be between stock pressure as printed on the door pillar and the max pressure on the new tires. I'd say split the difference for a starter.

 

I never +1'ed (or 2'ed) a car, so I know there are many people who would have real world experience. You may want to go up in pressure (maybe 38psi) to protect the investment, and then back down until you have the comfort/traction back you are happy with, or keep it there or higher if it works. Be careful tho, as this may change things a bit and cause your car to be squirrely, so don't try hammering on it right away and wind up getting out of control, take baby steps.....

 

I'm actually at 38 psi on my 20's, but I'm not sure about his 19's

 

I try to keep my 19's with Falken tires at 34-35 psi.

 

thanks guys!!!

 

i got 20's i stay around 35psi