I would agree with Jim those tires are getting pretty old. Unfortunately Michelin isn't makeing the 110 front or the 150 rears anymore so they are probably out unless you find some on the internet somewhere. For the time being I would roccomend starting those tires at 30 psi front and 26 psi rear cold. Check your hot temps and shoot for 33 front and 28 rear hot (actually just off the track on a hot lap not just on the warmers)