Have added 16 Iroc-Z wheels, the tires that are on there are 235/55/16. What is the fact psi? What is the fact psi for 245/50/16 tires? What is the recomendations?

 

both the same as most auto tires 32-35 psi

 

 

in the gm service manual it says 30 psi
but i notice much better handleing with 32-35 psi

 

In my tires i always run at the max psi as stated on the side of the tire or just a couple of psi lower. I notice that handling is much sharper. I don't like it when the tire starts to roll over and you can feel it.

 

I run 36psi on my street cars.

 

On the street I usually run mid 30’s on the front and low 30’s in the rear. Autox I’ll bring the rear up to the mid 30’s and the front to the low/mid 40’s, helps keep a tallish tire from rolling over. At the dragstrip with radials I run 32-36 rear (best traction) and 50 or so front (less rolling resistance), with DR’s on a car that needs more help to hook I might go as low as 14-16, but on something slow like my formula street pressures work fine.