15x12 Performance Roller Weights. Select Sizes on Clearance: 2.5g, 3.5g, 4.5g, 7.5g, 8g, 8.5g, 9g, 9.5g, 10g, 10.5g and 11g.Minarelli, 50cc 2-stroke 1PE40QMB Performance Roller Weights. These weights also fit many scooters from Yamaha including Zuma CW50, Zuma 50F, Vino and C3.We recommend starting performance upgrades by changing the variator roller weights before engaging in any performance upgrades.Heavier roller weights= A slower take off speed with more acceleration and a higher top speed.Lighter roller weights = A faster take off speed with less acceleration and lower top speed.Please see our Warranty & Returns Policy. Roller Diameter: 15mm Roller Width: 12mm