For 415 Chain 49cc 50cc 66cc 80cc 2 Stroke Motorized Bicycle Size: 44T sprocket; 1.5" adapter package include:1 x Sprocket 1 x CNC Adapter Please allow 0.5-1 inch difference due to manual measurement.(1 inch=2.54cm) We provide clear pictures, measurements where possible. Please compare its appearance, shape and size with your original unit and make sure that it can fit your machine before ordering.