Crankshaft SCHMITT Drehfreund 44mm stroke, 85mm conrod, 50-75cc, Simson S51, S70, S83, M50

Schmitt “Drehfreund” crankshaft for racing and engines with high peak performance. This premium crankshaft has 44mm stroke and an 85mm CNC machined forged connecting rod. Schmitt defines the application range of this crankshaft as engines from 50-75cc displacement suitable for Simson S51, S70, S83 with M500, M700 engine housing.
The technical highlights at a glance:

• Fits from 50cc to 75cc displacement
• Optimized pre-compression for a wide torque band, narrower cheeks compared to the steam hammer version STT42038
• balance factor of 65%
• High-strength, yet lightweight
• larger, silver-plated piston pin bearing 12x17x15mm for 12mm piston pin included
• the upper and lower needle bearing is optimally lubricated by several extra-large holes in the connecting rod
• extended crankshaft stub on the clutch side for an optional 3rd crankshaft bearing
• Bottom-guided connecting rod with reinforced interference fit and larger connecting rod eye
• Lighter than the original crankshaft
• Resistant to speeds >15,000 rpm
• Made from 14NiCrMo13 steel
• Developed in Germany - manufactured in Europe

44mm stroke, 85mm conrod, 50-75cc, Simson S51, S70, S83, M500, M700