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e*thirteen Helix Race Alloy e*spec Crank Arm Set BOSCH SX Brose S Mag TQ HPR50 21.5mm Offset 165mm Self Extractor Silver 38mm Diameter bncs hero{background:#d8d1c8 SP0409 bncs hero{background:#d8d1c8 For use with vintage cranksets we recommend a set of our 10mm bolts and you will use your existing bolt nut for the 5th hole A high performance weight optimized alternative to carbon fiber for riders who prefer alloy cranks These 24mm ISIS interface cranks are engineered for compatibility with Bosch Gen 4 Brose S Mag TQ HPR 50 Fazua Yamaha Maxon and Specialized Brose motor systems
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