Feature:1. Compatibility: Replacement for Coleman Powersports Bt200x Ct200uEx Ct200uExr; Replacement for Hensim Mini Bike Mb165 Mb200 and more.2. Characteristic: This rear sprocket has 50 tooth, is compatible with the 420 chain only. Be sure to measure your chain or current sprocket before ordering.3. Dimensions: The center mounting hole diameter of the rear sprocket is 40mm / 1.57in, and the overall diameter is 20.5cm / 8.07in.4. Premium Material: Made of rugged metal material, this rear sprocket cog is sturdy, high temperature resistant, not easy to break and deform.5. Easy Installation: The chain sprocket is easy to install and disassemble, and only needs a simple tool to quickly complete the replacement.Specification:Item Type: Rear SprocketMaterial: MetalNumber of Teeth: 50TChain: for 420 ChainCenter Installation Hole Diameter: Approx. 40mm / 1.57inOverall Diameter: Approx. 20.5cm / 8.07inFitment:Replacement for Coleman Powersports Bt200xReplacement for Coleman Powersports Ct200u-Ex Ct200u-ExrReplacement for Coleman Powersports Ct200u TrailReplacement for Baja Motorsports Mini Bike Mb165 Mb200 (Heat, Mini Baja, Warrior)Replacement for Hensim Mini Bike Mb165 Mb200 (Heat, Mini Baja, Warrior)Replacement for Massimo Mb200.Package List:1 xRear Sprocket4 x Screw4 x NutNote:Be sure to measure your chain or current sprocket before ordering. 420 chain has 1/2in pitch and 5/16in roller diameter.