68-48 drive ratio. This is a bolt-in belt drive kit that will fit inside the OEM primary housing; without much modification. Designed to be used in rear belt drive applications but will also work on models that run rear chains. Comes complete with an E.T.C. ball bearing lock-up clutch clutch assembly with Aramid plates and a sealed primary bearing. Note: See 518912 for the Aramid; replacement belt 130t; 8mm; 42mm wide.