Forged aluminum arms keep you confident on the trail, while alloy self-extracting crank bolts mean efficient routine service, and minimum added weight. Added details like pedal washers, molded impact boots, and e-rider preferred shorter lengths deliver all the high-end features you'd expect from a crankset well over its price.Specification:Chainring: Helix Race E*spec Chainring, Helix Core Steel Chainring, e*spec Plus rings, 104BCD spider, or other rings designed to fit Bosch G4, Brose S Mag, or TQ HPR50 (sold separately)Colour: BlackCompatibility: Compatible with Bosch, Brose S Mag, TQ HPR 50, and Fazua Ride 60Included: Crankset, Crank Boots (x2), Sticker, User ManualLength: 155mm, 160mm, 165mm, 170mmMaterial: Forged AL-6066-T6 armsSpindle: Compatible with 24mm and 30mm ISIS SpindlesWeight:24mm | Bosch | Brose | TQ Model Weights155mm: 481g160mm: 497g165mm: 513g170mm: 529g30mm | Fazua Model Weights155mm: 448g160mm: 463g165mm: 478g170mm: 493g