The Thunderbolt crankset is one of the most technically advanced crank designs on the market. Thanks to continuous improvements to our legendary 41-Thermal® processing and heat-treatment system, fatigue life has been increased by a significant margin.
41-Thermal® heat-treatment process
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
US Patent No. 7,267,030
SPECIFICATIONS
Material : 4130 chromoly steel with proven 41-Thermal® processing