Elitefitness, Inzer and Titan, a levered or ratched belt is the way to go, you get the support of a double pronged without the pain of installation and removal. I bought a double prong from Titan in 1987 and I just replaced it with an Inzer levered, I passed the ol' titan down, the point is buy 13mm and get a quality belt, the few extra dollars will yeild extra years of life.