crankshaft Schmitt Drehfreund 44mm stroke, 85mm connecting rod for Simson S51, S70, S83, M500, M700

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Crankshaft Schmitt "Drehfreund" for racing and engines with high peak power. This premium crankshaft has 44mm stroke and a 85mm CNC machined forged connecting rod. Schmitt defines the range of application of this crankshaft on Big Bore engines from 50-75cc displacement suitable for Simson S51, S70, S83 with M500, M700 engine cases.

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
.
• optimal balance factor of 65%
• High strength, yet lightweight (<70g) forged connecting rod- CNC machined, for large 17mm needle bearing on piston pin
.
• Larger silver plated piston pin bearing 12x17x15mm for 12mm piston pin included
.
• The upper and lower needle bearings are optimally lubricated by several extra large holes in the connecting rod
.
• Expanded crankshaft stub on the clutch side for an optional 3rd crankshaft bearing
.
• Lower guided connecting rod with reinforced interference fit and larger connecting rod eye
.
• Lighter than the original crankshaft
.
• Rotation speed resistant >15,000 rpm
• manufactured from 14NiCrMo13 steel
• Developed in Germany- manufactured in Europe