1.Replacement for Chinese & Janpanese 4 stroke GY6 49cc 50cc short case engine based Scooter Moped 2.Circumference: 669 mm ( 26.3 inch),width: 18 mm ( 0.7 inch),pitch: 30 degree 3.Please check the pictures and specifications for compatibility before placing orders. 4. focus on provide high quality products at fair price: Professional factory, Professional technical support; 3 Months warranty; if you unsatisfy with our product, you can return to our USA warehouse, no risk. Product Description Replacement for Model: 2008 Roketa 50cc Tank Urban 50 Sporty50 Roketa Bahama Maui Sicily Tank Baotian 50QT-9 Maui MC-08-50 Bahama MC-07-50 Sunl SL50QT-7 SL50QT-2 Sporty 50 Dazon Diamondback Hammerhead/Adly Jet 50 Fox 50 Lance GTR50 Baja SC50 BE50 JL50QT-15 JL50QT-16 Jonway Beta50 Lambda 50 QT-6 QT-21 YY50QT5 YY50QT6 YY50QT21 JMstar Breeze Z-bike Longbo LB50QT-6 LB50QT-22 MotoFino MF50QT MF MF50QT-7 Eagle 49cc Excaliber Vanguard 50 Ta