Specifications for Sprocket These Wheels Sprockets are typicaly used in electric scooters and smaller gas powered applications 65T Wheel Sprocket Weight: .24kg Type of chain: #25 Freewheel: Optional Inner Diameter: 54mm Outer Diameter: 133mm Distance Between Screws Diagonaly: 71mm Distance between screws Verticaly/Horizontally 52mm Specifications for Freewheel Suitable for any of the #25 or TF8 wheel Sprockets we sell Weight: .17kg Inner Diameter: 34mm Outer Diameter: 77mm Distance Between Screws Diagonaly: 71mm Distance between screws Verticaly/Horizontally 52mm