The Thunderbolt + is the new & enhanced descendent of the Twombolt. It is still one of the most technically advanced crank designs on the market. Due to continued advancements in our legendary 41-Thermal processing & heat-treatment system, fatigue life has been increased by a massive margin. section Product Specs Crank Type: 2pc Spindle Diameter: 22mm
Includes:: BB: Yes Weight: 799g / 28.16oz