Top Racing crankshaft suitable for Sachs or Hercules 503, 50/2, 2-speed.Difference to Sachs 3- / 4-speed crankshaft with part number 44015: cheek pin diameter is smaller (E15 bearing must be used).The crankshaft can also be used on Sachs 503 engines. Attention, the drive wheel can drag on the housing here, with 1.5mm spacers the problem can be solved.Technical data: Ignition-side cheek pin overall length: 64mm Ignition-side cheek pin diameter: 15mm Clutch-side cheek pin overall length: 41.2mm 1st shoulder - cheek pin on clutch side - diameter: 15mm 2nd shoulder - cheek pin on clutch side - diameter: 12mm Thread on both sides: M10x1mm Suitable for 12mm gudgeon pin.