e*thirteen Helix Race Alloy e*spec Crank Arm Set - BOSCH SX-Brose S Mag-TQ HPR50 21.5mm Offset 155mm Self Extractor Silver -Belted Formulated specifically for bicycle chains

Formulated specifically for bicycle chains

X-GLIDE 2 improves both inboard and outboard shifting as well as chain retention

It also reduces maintenance downtime by minimizing the amount of debris hitting your stanchions and fork seals

4mm crown race

e*thirteen Helix Race Alloy e*spec Crank Arm Set - BOSCH SX-Brose S Mag-TQ HPR50 21.5mm Offset 155mm Self Extractor Silver -Belted Formulated specifically for bicycle chainse*thirteen Helix Race Alloy e*spec Crank Arm Set BOSCH SX Brose S Mag TQ HPR50 21. 5mm Offset 155mm with Self Extractor Silver. 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