Shimano zee m640 10 speed chainsetdurable reinforced crankset the thick wall aluminum construction on the zee twopiece cranks and reinforced steel axle translate to additional confidence on the trail with an axle 30 stronger than comparable trail cranks and smooth running accurately aligned chain wheels the zee crank will perform reliably run after run the crank arm features outboard bearings and steel pedal inserts shimano introduces zee a new line of gravity components that are an id