Shimano Part Number: Y1KS13000. Shimano Ultegra/105/LX/Sora/Tiagra/Deore/Alfine Crank Arm Fixing Bolt. Alfine FC-S501. Tiagra FC-4600 / FC-4650 / FC-4603. Deore FC-T611. Sora FC-3550 / FC-3503. Ultegra FC-6700 / FC-6750 / FC-6703.
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