Black Series by Tune E-Type External Bottom Bracket Cups

The cranks integrated 30 mm axle and wider spaced bearings allow BB systems to be configured for practically all current Bottom Bracket standards, while offering increased stiffness, durability and performance. Each system consists of the highest quality & lowest rolling resistance bearings with additional seals, precision machined external cups or BB inserts and a combination of spacers to achieve perfect chain alignment. Designed and engineered to the highest standards and manufactured with an unrivaled level of accuracy to achieve the highest levels of performance and durability. Read more…