Tire PSI for 225/45-17's

[svxash]

So on my summer tires which are 225/45-17's. Should I run the same pressure as the stock 225/50-16's or should it be different?

[LetItSnow]

That's going to vary by tire model and by what you want the tires to do. We need a lot more information.

[Crazy_pilot]

What Rob said. I run my 245/40/17's at 40 front, 35 rear because I find the General Exclaim UHP's a little on the mushy side.

[LetItSnow]

I have 225/50/16 Pirelli P Zero Neros that I typically keep at 40psi front and 38psi rear for a balance between a firm and smooth ride.

Come winter, I use 205/55/16 Bridgestone Blizzaks somewhere in the mid 30s.

I also have 245/40/17 Bridgestone RE01Rs for autocross days, running 40-44psi depending on track conditions, and there's never any appropriate match front to back. At Cherry Valley (our local kart track), I bump the front right tire 2psi because of the track's shape!

My science? Best guess and feel for initial setting, and manufacturer's recommendation for proportion.

[svxash]

I have the Kumho Ecsta ASX. The door sticker for the stock size is F33 R29 and that's the pressure I use for my winter tires. Since these are a different size I wasn't sure. I just want to make sure I don't run them too low because of heat build up or too high and cause them to wear out too fast.

[Nevin]

You can just put in whatever the max. is on the tire (it'll say in small print right on it) and then just subtract a few psi (4-ish) from the rear tires.