Polini Speed Drive Evolution 3 is milled out of one whole piece of aluminum and has subsequently been given a lightweight alloy and therefore weighs as much as 500 grams less than normal steel pulleys, in addition to being ceramic coated. The ceramic coating allows a better transfer of engine power as well as lower operating temperatures around the pulleys, which also gives the V-belt better conditions to maintain a good grip. These choices from Polini ensure more aggressiveness in starts and accelerations. Creramic Speed Drive Evolution 3 from Polini has a roughness on the pulleys of 4 microns, which according to Polini's own tests, provides the most optimal surface for the V-belt, without impairing the life of the V-belt.
The pulleys are 128 mm , where the standard is 120 mm , therefore it is necessary to mill in the motor / kick starter shield before these and the belt can be mounted. You can only use these pulleys with an oversized V-belt (Overrange etc.).
NOTE: For PGO, it is not necessary to mill in the motor to mount these.
Note: Supplied as shown in the pictures, including pulley grease and accessories.