Performance full circle crankshaft Evolution" from Top Racing suitable for Sachs, Hercules Prima moped with Sachs 505 (2-speed) engine.The cheeks are finely balanced. For this purpose, 2 aluminium inserts are used to reduce weight. A HD needle bearing for the piston pin is included. Top Racing crankshafts are manufactured by the Portuguese quality manufacturer Jasil.Technical data:Stroke: 44mm Ignition side cheek pin overall length: 74mm Ignition side cheek pin diameter: 14.95mm Clutch side cheek pin overall length: 77.5mm 1st shoulder diameter (coupling side cheek pin): 14.95mm 2nd shoulder diameter (clutch side cheek pin): 11.67mm Thread (on both sides): M10x1mm "