Shimano BB-RS501 Hollowtech II Italian Bottom Bracket Sram Rival Direct Aero Mount: The Speedfil

Direct Aero Mount: The Speedfil Z4 Cage is designed with numerous ports for a direct BTA mount into the aerobar extensions with a minimum of 4 nylon zip/cable ties (included)

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1% efficiency)

Designed to prevent punctures and increase tire life

This integrated system delivers the power and engagement required to take on everything from steep climbs to all out racing

Shimano BB-RS501 Hollowtech II Italian Bottom Bracket Sram Rival Direct Aero Mount: The SpeedfilThe Shimano BB RS501 bottom bracket features an enhanced seal construction to provide long lasting performance and service life. Designed for a perfect fit with Hollowtech II 24mm crank spindles Anodized aluminum cups are high strength and light weight For use with Italian threaded bottom bracket frames keyword search: RS 500 Spindle Interface Type: Shimano Hollowtech II BB Shell Width (mm): 70 Bottom Bracket Shell I. D.: 36 Defined Color: Silver BB