i have them at 42...... is that to much?

 

Yes that would normally be considered a high air pressure for every day use, unless your biggest concern in rolling resistance (MPG) or you are running a very heavy rig (7000-8000 lbs).

You are compromising your ride quality and tire footprint (traction and wear).

 

OMG man WAY too high! I run mine at 33.5psi and they're sweet! I put a little too much air in them one time and had them at around 37psi and they felt like bricks. let it out...

 

OK...I have my 315's at 37lbs right now was thinking of dropping 2lbs a day till I get it right...whats everyone running at?

 

I run my 35s at 28 - 30 psi and it rides just fine.

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