The Thunderbolt is one of the most technically advanced crank designs on the market. Due to continued advancements in our legendary 41-Thermal® processing and heat-treatment system, fatigue life has been increased by a massive margin.
Features Proven 41-Thermal® processed 4130 chromoly Legendary lifetime replacement warranty Laboratory tested and team proven Traditional sprocket interface Updated open-ended spindle cap New wedge cluster band with greater flexibility Never-Wobble™ crank arm and spindle interface guarantee NOTE: In order to help lower MSRP, Thunderbolt Cranks no longer includes a bottom bracket, unless found in shops labeled as Thunderbolt+.
Specs Lengths: 165mm, 170mm, and 175mm Drive Side: RHD or LHD Spindle: 22mm Weight: 1 lb. 11.8 oz. (788g) US Pat. No. 7,267,030