Lasco 56T Forged Crankset with 170mm Forged Arms CNC Aluminum Chaingard for Folding Bicycles Perfect for ebikes and electric bicycles looking to sustain a higher speed. 170mm Crank Arm Length without any overlap of crank arm & chainring bolts Standard Bolt Circle Diameter (BCD): 130 Fits 9/16 inch pedals for on road, mountain, fixed geared fixies, BMX, track and single speed bikes All New Crank Arm Design is much stronger for faster and more aggressive riding