High Performance Racing Variator Kit with 6.5 gram Roller Weights for Chinese Scooter Moped ATV 4-Stroke 50cc 80cc 100cc 139QMB 139QMA Engine Front ClutchVariator Outer Diameter: 4.92 inches Variator Inner Diameter: 20mm Bush Size: O/D: 20MM; I/D: 14mm; Length: 38mm Roller Sets Weight: 6.5g Roller Weight Size: 16x13 mm Dimensions: 4.92 x 4.8 x 1.61 inches