BB-RS501

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The Shimano BB‑RS501 bottom bracket delivers smooth, reliable performance for road bikes using a BSA threaded shell and Hollowtech II cranks. With durable steel bearings and a ligh tweight aluminum cup design, it provides long‑lasting efficiency and easy compatibility across Shimano’s road lineup. Threaded BSA bottom bracket for 68/70 mm shells Compatible with all Shimano road Hollowtech II cranks Designed for 24 mm spindle systems Aluminum cups with durable steel bearings Smooth, efficient rotation for consistent performance Weight: 92 g Show more