
Refined 12-step gear combination provides peak efficiency and accelerating performance for every racing situation
Faster, smoother shifts under maximum pedalling force
Compatible with new 12-speed and road 11-speed FREEHUB body
CASSETTE SPROCKET,CS-R8100, ULTEGRA, 12-SPEED, 11-12-13-14-15-16-17-19-21-24-27-30T, IND.PACK
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