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Feature: 1. This is a bicycle small chain sprocket, made of good quality material. 2. 13 teeth, the teeth distance is 12.7mm, the thickness is 3mm. 3. Made of good quality aluminum alloy, sturdy and durable to use. 4. Suitable for ordinary bicycles. 5. Small size, lightweight. Very easy to install, and smooth performance. Specification: Condition: 100% Brand New Item Type: Pinion Gear Material: aluminium alloy Color: as picture shown 1016Z2 and Z3 reducer motor 13 tooth pinion Number of teeth: 13 Teeth distance: 12.7 mm Teeth Thickness: 3 mm Inner diameter: 11 mm Outer diameter: 58 mm Thickness: 9 mm Bolt width: 4mm (fixed tip key width) Applicable chain: ordinary bicycle chain (model 1/2x1/8) Applicable motor: 1016Z2, 1016Z3, 1018 reducer motor .w-e-text table td,.w-e-text table th,.wang-edit-text table td, .wang-edit-text table th{border: .5pt solid #000;};.w-e-text table,.wang-edit-text table{border: 1px solid #000 !important;} Package List: 1 x Pinion Gear