Re: Tire Pressure - Manual or on Tires?
42 it the tire's max psi. typically you will want to run around 36 for normal everyday riding. some brands like a little bit less. this is something you can experiment with. it's not something set in stone.
I typically run 35 even for spirited canyon carving. if I was going to go to the track I'd drop it down to 30 or 31 cold and test from there.
to answer your question 35 to 36 will give you decent grip once the tire is warm and decent tire life. the lower the psi the more grip but less tire life. two up riding air it up to 38 to 40