I started at 14psi and only got down to 12 1/2, but couldn't get a read if it liked the change or not since I also made a shock adjustment. I really just want to know if I am in the ballpark at 12 1/2 or could it like less? They still "look" like they have alot of air in them for slicks, but I don't have any experience with the stiff sidewall tires.