e*thirteen Helix Race Carbon e*spec Crankset - 165mm BOSCH SX-Brose S Mag-TQ HPR50 21.5mm Offset BLKe*thirteen Helix Race Carbon e*spec Crankset 165mm BOSCH SX Brose S Mag TQ HPR50 21. 5mm Offset Black. Helix Core cranks provide an e bike drivetrain upgrade with high end features and aesthetics at an exceptional value. Forged for e Enduro strength with alloy self extractor bolts pedal washers and molded impact boots. 24mm ISIS interface models are compatible with Bosch Gen 4 Brose S Mag TQ Fazua Yamaha Maxon and Specialized Brose motor systems.
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