Crankshafts at SIP Scootershop - Overview

The crankshaft is the heart of an engine. Briefly explained, the crankshaft converts the movements of the piston into the rotating drive impulse via the conrod. Especially when tuning, this component is therefore subjected to enormous forces. If you drive along a country road at a constant 4,000 rpm for three hours, your crankshaft will rotate 720,000 times! That's quite a few revolutions in a scooter's lifetime. So it makes no sense to save on the crankshaft, but first you should limit the flood of crankshafts by choosing the right vehicle category.

When searching for the right crankshaft, you can first select the "category" at the top, for example "Classic Vespa". Then you can enter the exact "vehicle type" in the field below and all the crankshafts that come into question will be displayed.

The different crankshaft types

Standard crankshaft
Standard crankshafts are copies of the originals. However, some models have been improved, e.g. a gudgeon pin bearing for lower friction torque instead of a bronze bush or a polished forged connecting rod. The transition to racing crankshafts is sometimes fluid.

Racing crankshafts
By racing crankshafts we basically mean all crankshafts that deviate from the pure standard specifications. So:

• different crank web shape

• more stroke

• longer or higher quality conrod

• Clutch/pole wheel stub not intended for the original parts

• optimised inlet geometry due to shape and cut-out

For the classic Vespa models, the range is so large that we still divide them into Disc valves and Diaphragm shafts and diaphragm shafts.

Special racing crankshafts
Special crankshafts require special crankcases. They do not fit into the original crankcases.

Our top brands for crankshafts

Depending on the vehicle class, the manufacturers are represented differently. Here are the most important ones: