Hi Kevin, I started at 40 psi and that is where I have stayed. It works very well for me there!! Welcome to the Darkside!!! I have been Darksiding for almost 17,000 miles now and double Darkside (Avon Road rider rear tire on the front, although the Avon Roadrider is marked for direction of rotation for front and rear. I have over 12,000 on the road rider and it still looks like new.