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: 160mm, 165mm, 170mm, and 175mmDrive Side: RHD or LHDSpindle: 22mmSprocket Interface: Press-fit(Must use sprockets with 15/16" hole)Weight: 1 lb. 11.8 oz. (788g)US Pat. No. 7,267,030
