In this article I will review the Kogel Bearings Shimano Crank Arm Fixing Bolt, or as Shimano calls it the crank arm cap or pre-load cap. Default Shimano uses plastic versions of this component Y0N500025. For the Dura Ace 9000 cranks I’ve exchanged it with a grey anodized Wheelsmfg FIX-BOLT-1 from 6061 aluminum. The Kogel Bearings Crank Arm Fixing Bolt will go on the Deore XT M8100 Hollowtech II crank arm (with 4iiii power meter).
