Compitability: Coleman BT200X,CT200U-EX, CT200U Trail, Mini Bike MB165,MB200, Massimo MB200, TrailMaster MB200. Baja Warrior Heat Massimo MB165 MB200 196cc 6.5hp Powersports Mini Bike. Specification: 50 tooth rear drive wheel sprocket,only fit for #420 chain,overall Diameter: 206.2mm (8.116").Mounting Hole Distance:80 mm(3-3/16"). Package Include:1 x 420# drive chain sprocket 50T,1x Chian Master Link Note: Be sure to measure your chain or current sprocket before ordering. 420 chain has 1/2" pitch and 5/16" roller diameter.This rear sprocket is used on many Chinese 50cc-125cc engines.Center Hole Diameter:40mm (1-9/16")Bore. Material: heavy metal, thick sprocket. Our 420 chain 50 tooth rear sprocket for Coleman CT200U minibikes is made of machined steel. FITMENT: Coleman BT200X,CT200U-EX, CT200U Trail, Baja Mini Bike MB165,MB200, Massimo MB200, TrailMaster MB200. This rear sprocket is used on the Chinese 50cc-125cc engines. This sprocket has 50T and is compatible with #420 chain only.Please check the measurements or contact us before you buy.