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Compatible with your 5-arm vintage cranks and Surly cranks. Four of the five holes are threaded. For the one on the back of the crank, please use a 10mm bolt. Wolf Tooth's patented Drop-Stop tooth profile prevents chain derailment. Compatible with 10-speed, 11-speed, and 12-speed (including SRAM Eagle) chains. If using a 9-speed drivetrain, please use a 10-speed chain.
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