If you have spokes & tubes, I run 36 on the rear as a norm in South Florida, and factory specs on the front which is 31 psi . Check the front tire pressure periodically, it seems to fluctuate more than the rear. I run Commander II's and they are wearing well. I just replaced the rear at 15,000, and the matching 15,000 front tire is not even 40 % worn. Likely I'll see 25,000 to 30,000 on the front, and I am hard on tires.