This chinese chain adjuster fits many 4-stroke models of ATV’s, dirt bikes, go karts, scooters, & mopeds. It is used with many 50cc – 110cc ATV’s & dirt bikes. Product Specs: Roller Width: 40mm (1.58″) Surface Area Width of Roller: 28.7mm (1.13″) Roller Diameter: 32.4mm (1.27″) Center of Roller to Center of Bushing Length: 116mm (4.56″) Shaft Diameter: 12mm (.47″) Bushing ID: 9.4mm (.37″) Spring is Included Known to fit Coolster, Roketa, Sunl, Tank, Wahoo, Yamoto, and Taotao, along with many other manufacturers Be sure to check your measurements to verify this adjuster is the correct application for your model.