I'd still go Delrin as far as deflection and stiffness, it will last forever. Polyeurethane has a much lower durometer than Delrin, and its self lubricating. Javad In a message dated 11/12/2001 8:17:07 PM Pacific Standard Time, randrews at sbcglobal.net writes: << Squeeking, who cares, this is a track car. I want performance ;) >>