Cannondale Lefty 50 Hub Axle Cap and Bolt QC117/The Cannondale Lefty 50 Hub Axle Cap and Bolt is used to fashion the Lefty wheel to the Lefty axle. The Axle Cap is reverse threaded while the bolt is standard threaded. Compatible with vintage Lefty Hubs, Lefty SL hubs, and Lefty 50mm hubs including Lefty Oliver. NOT compatible with SuperMax Lefty, Lefty 2.0, Lefty 60 or Lefty Olaf hubs. The Cap fits using a standard cassette tool while the bolt takes a 5mm hex wrench. Kit includes one alloy cap, one alloy bolt, and one inner bearing seal.769753848795