MMG Variable Speed V-belts offer stability and flexibility at the same time. Quality made for high mileage and reliability. Oil and heat resistant. BELT SIZE: 669 x 18 x 30 Fits 49cc/50cc 4-Stroke Engines (QMB139) MMG MGV669Z Standard Belt replaces OEM Belt 669 18 30 Quality made for high mileage and reliability Oil and heat resistant Save time and money, go for quality Kevlar belts will last longer than a standard belt, they don’t slip easily. Premium belt provides longer durability for high performance applications. This belt is your best choice for an upgrade. Fits on many scooters, motorcycles and go karts. Quality made for high mileage and reliability. Oil and heat resistant. Part No.: MGV669ZOutside Circumference (mm): 669 (26.34 inch)Top Width (mm): 18 (0.71 inch)Groove Angle / Pitch: 30 degree Fits Tao Tao ATM50 , VIP 50 , Baccio Heat 50 , Baccio Miami 50 , Peace 50 cc , Baja SC50, Panterra Freedom 50cc, Panterra Fusion 50cc, Panterra Retro 50cc, QMB139 50cc/49cc , Roke