Ultegra Left Crank Arm Option 1:170mm

Ultegra Left Crank Arm Option 1:170mmShimano Ultegra FC R8000 Left Crank Arms

Recycled synthetic insulation packs small and dries quick so it’s great for wet or humid conditions

4 line Macro Monitor gives 4 pieces of data at a glance

Run time up to 26 hours (street f-650) and 11 hours 15 mins (avenue r-50 cob)

simply snap onto chain

Its fast-rolling tread cluster and high-speed center T5 compound ensure unmatched straight-line velocity

Fabric Content: 58% Polypropylene

but otherwise

Compatible with SRAM models: RD-70-A1

64mm wide platform and 700mm² contact surface provides maximum power transfer and distribution of foot pressure

Inner and outer plate chamfering provide accurate and expeditious shifting

D’Aluisio Smartweld

DT Swiss 240 Star Ratchet internals