Left Lane Muscle

Hey guys, I have 275/40/18 up front and 295/45/18 in the back. What pressure would you guys recommend I keep them at? Thanks

redonblackpony

If it's only Street driving, fill to recommended by the tire manufacture. Most likely it will be 35 PSI-40 psi

Left Lane Muscle

Thanks for the answer man. Will do

PJRManagement

35psi for street.

07 Boss

Generally wider tires, given the same load, will require less air. lowering or raising air pressures will effect handling too. I run a 255/45 up front at 41 psi and a 305/45 in the rear at 28 psi. I would run the rears at like 24 psi but the pressure sensor doesn't like that. The harder front tire is to help with any tramlining or nibbling and the softer rear tire is help with traction. So I would follow the recommended pressures and adjust from there.

m05fastbackGT

I run mine between 32-35psi..

Bert

For the street, I would run them up fairly high like 35-40 psi like Redonblack said. This will reduce the rolling resistance a little for a hair better mileage. It won't give ultimate maximum performance, but you can't use that on the street anyway.

For the track, the "optimum" is probably much lower, like 30-ish . . . but that is best determined by adjusting the pressure based on the amount of sidewall roll-over that you are getting on hard cornering, which really can only be done on the track.