These rollers are 15X12mm in size and fit most stock variators for 50cc scooters. These calibrated, high precision rollers by Malossi work with variators that use a 15x12mm roller.. The Malossi Rollers are made with a specific formula of CPT. Each roller is marked on the side with their weight. The Malossi rollers are a more technical, and precise part over the original ones, in a complete series of calibrated elements capable of varying your scooter's transmission ratio and perfectly regulating its speed and acceleration.

Operation
Due to the rotation of the variator, the weight of the rollers creates centrifugal force; the higher the rollers weight, the lower the gear change time, and vice-versa. To optimize your engine's performance, select rollers that, in operation, maintain the engine at the highest power regime. By decreasing the rollers weight the engine s RPM increase; on the other hand, by increasing the rollers weight the RPM decreases.

This part works on
All scooters and variators that use a 15x12mm Roller. This is the size roller used in the most stock variators and some aftermarket variators for 50-100cc scooters.