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Tight tolerances and precise torque specs mean precision parts like this MegaExo 12 Left Arm Crank Bolt need to be replaced from time to time. Make sure the heart of your drivetrain is secure, and pick up a spare or two today.

This is an FSA MegaExo Crank Arm Bolt for 19mm MegaExo alloy cranks - Designed to fit alloy FSA cranks only - Includes M12 bolt, M27 self-extracting cap, and washers