Helix R e*spec AL Crank Arm Set – 155mm BOSCH Gen4-Brose S Mag-TQ HPR50 with Self Extractor Bronze. 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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