Shimano BB-RS500 Hollowtech II Press-Fit Bottom Bracket rotor-separate* Follow Function is an elastomer

Follow Function is an elastomer shock absorber which allows the saddle to follow your movements when pedaling while seated

Re-tuned Charger 2 damper for next level compression and rebound control

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The 9-tooth sprocket allows full range with zero drop in efficiency

Shimano BB-RS500 Hollowtech II Press-Fit Bottom Bracket rotor-separate* Follow Function is an elastomerShimano BB RS500 Hollowtech II Press Fit Bottom Bracket. Shimano BB RS500 Hollowtech II Bottom BracketsFits Shimano Hollowtech II Cranksets TECH SPECS Bottom Bracket Shell I. D. 41 BB Frame Interface BB86 BB Shell Width (mm) 86 Weight 73 Spindle Interface Type Shimano Hollowtech II Defined Color Black