In the new Zee group, the crankset has only 1 sprocket, thin arm walls consisting of two pieces of aluminum along with a reinforced steel axle. Shimano promises that the axle used is 30% stronger than in similar products from competitors. The crank comes with external bottom bracket bearings as standard, but there is also a version compatible with the Pressfit BB system. Steel pedal inserts are designed to strengthen the design. The crank for a standard 68/73mm axle .
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