NEW Shimano Ultegra FC-R8000 Crankset 172.5mm, 53/39t, groupset-front-1x The EX1 drive train was

The EX1 drive train was designed specifically for the demands of electric-assist mountain bikes: a wide gear range with bigger jumps between gears and sturdy components to handle higher torque loads

*Fork decals are not compatible with 32 Step-Cast or 34 Step-Cast forks

Easy-to-use bike hold downs with ratcheting straps grip the bike’s frame

Rotor construction uses Shimano FREEZA technology to boost heat dissipation and reduce fade

NEW Shimano Ultegra FC-R8000 Crankset 172.5mm, 53/39t, groupset-front-1x The EX1 drive train wasThe Ultegra Hollow Tech II Crankset features an optimized lightweight design that doesn't sacrifice stiffness. Wider gear pitch increases clearance between chain and leading teeth Defined Color: Black Rings: 53 39 Spindle Interface Type: Shimano Hollowtech II Chainring BCD: 110 Shimano Asymmetric Color: Black Chainline Hub Compatibility: 130 Hubs Chainline Hub Compatibility: 135 142 Road Disc Hubs > 415 mm Chainstay keyword search: IFCR9100DX39