Octane One 3PCS Crankset Super strong & very light 3 piece crankset made from high quality seamlesscro-mo steel with unique bottom bracket system. The crank axle isdrilled, the cromoly arms are seamless & fully heat treated. The chain lineis perfect for MTB! Great looking square crank arm shape. For 2014 offeredwithout bottom bracket / bb available separately. Specifications:arms: 170mm length, cro-mo seamless 4130axle diameter: 19mm x 8tweight: ~990g Buy Octane One 3PCS Crankset from Chain Reaction Cycles, the World’s Largest Online Bike Store.