Bicycle Bike Sprocket Fixed Single Speed/ Cog Thread Ring 12 13 14 15 16 17 18T.
Specifications: 12T 13T 14T 15T 16T 17T 18T. Applicable: Mountain bike multi-speed to single-speed, suitable for 7/8/9/10/11-speed chain. This product is only a toothed piece, without gasket and flywheel cover.