e*thirteen Helix e*spec Crank Arm Set - 170mm BOSCH Gen4-Brose S Mag-TQ HPR50 Self Extractor BLK MPFN-25497 Enhanced lower leg stiffness with

Enhanced lower leg stiffness with “M” arch design for maximum tire clearance

100% Surly Chromoly steel frame and fork

100% Surly Chromoly steel for comfort and durability

Color Gold Half Link Chain No Drivetrain Speeds 9 Defined Color Gold Links (links) 116 Weight 272 Chain Connection Type Reusable Master Link Width 6

8 Width 810

e*thirteen Helix e*spec Crank Arm Set - 170mm BOSCH Gen4-Brose S Mag-TQ HPR50 Self Extractor BLK MPFN-25497 Enhanced lower leg stiffness withe*thirteen Helix e*spec Crank Arm Set 170mm BOSCH Gen4 Brose S Mag TQ HPR50 with Self Extractor 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.