e*thirteen Helix Race Alloy e*spec Crank Arm Set – BOSCH SX-Brose S Mag-TQ HPR50 21.5mm Offset 165mm with Self Extractor Black. 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. They come in short lengths, starting at 155mm, for improved pedal clearance and are tested to E-Enduro standards.

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