GOOFIT 669 18 30 Premium Drive Belt for 4 Stroke GY6 49cc 50cc Moped Scooter 139QMB It fits for Chinese & Janpanese 4 stroke GY6 49cc 50cc short case engine based Moped Scooter Circumference: 669 mm ( 26.3 inch),width: 18 mm ( 0.7 inch),pitch: 30 degree Please note,Chinese GY6 50cc 4 stroke take 2 types different belt size,669 and 729.this is 669 Arrival within 1-2 days (Sold by GOOFIT and Fulfilled by Amazon) Arrival within 7-15 days (Ships from and sold by GOOFIT)