Precision-engineered crank bolts designed for Bafang Ultra mid-drive motor systems. This set of two steel bolts with integrated washers delivers the secure, waterproof connection your crank arms demand. Measuring 20.6mm diameter with 21.2mm total length and 13.1mm thread engagement, these M15 bolts ensure reliable installation and long-term durability in demanding riding conditions. Compatible with Bafang Ultra crank arms and select ISIS/Octalink configurations. Verify fitment against your specific motor and crank specifications before installation.
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