Shimano ES300 Bottom Bracket - Shimano Octalink

Shimano manufactures a wide range of different cranksets and matching bottom brackets so that the optimum system will always be available for each kind of bicycle and riding style. Specifications: Application: Cross Country, City & Touring Type: BSA Shell Width: 68 mm, 73 mm Axle Length: 113 mm, 118 mm, 121 mm, 126 mm Axle Type: Octalink (MTB) E-Type Compatibility: no Chain Guard Compatibility: no Technical Information: Bearings: steel Axle Material: steel Bottom Bracket Cup Material: resin (left), steel (right) Compatibility: - FC-T521 - FC-T4010 - FC-T3010-8 - FC-M523 - FC-M522 - FC-M4000 - FC-M3000-8 Features: - hollow pipe construction - rigid and light for efficient power transfer - 26 g lighter than BB-ES25 - quick and precise mounting - asymmetric axle, mind the compatibility Technology: Octalink Compare the power transfer of Octalink with the conventional square taper spindle, and the 8-splined Octalink interface that connects bottom bracket and crankset increases the strength and rigidity of the entire assembly. Model Index: BSA 68x121: Threads: BSA Shell Width: 68 mm Axle Length: 121 mm Factory Number: E-BBES300B21