The Polini Evolution crank is designed for use with the Polini Big Evolution 84ccm cylinder kit and is therefore made with a rod85 connecting rod. Of course, it can also be used with other cylinder kits using this or in combination with a 5mm spacer under the cylinder. The connecting rod is forged and thus greater strength is obtained. The shaft in the variator side is also considerably larger than on a regular crank and this is done to increase the strength. Due to the size of the shaft, a back plate is provided for the variator with a larger hole, as well as a larger bushing for use with the variator.