125cc-150cc GY6 Crankshaft Overall Length: 285mm Flywheel Thread Size: M12x1.25 Flywheel Thread Length: 14mm Drive End Thread Size: M12x1.25 Drive End Thread Length: 14mm Item 1214E Inner Diameter (piston pin hole): 15mm Number of Splines: 19 Main bearings included Bearing marked 63/22x2. (Inner Diameter: 22mm, Outer Diameter: 56mm)