Strong and stylish 7075-T6 aluminum cranks durable enough for MTB, Bikelife, Racing, and casual street BMX. These use a proprietary spline-drive system that allows a wide range of chain-line adjustments without a need for "offset" sprockets (see details below). Includes full crankset, two pre-load rings, bottom bracket spacers, sprocket, and a 24mm diameter spindle. 

146mm BMX spindle - chainlines 41mm to 45mm
160mm MTB spindle - chainlines 49mm to 53mm

170mm crankset w 160mm spindle and bolts = 735g
34T flip-flop sprocket = 111g