GOXBERK Threaded Lock Rings Bicycle Freewheel Hub Locking 13T 14T 15T 16T 17T 18T Fixed Gear Freewheel Fixie Bicycle Cog Fixie Track Bike Wheel Cogs Bicycle Accessories

Net weight: Approx. 50-90 grams Full height: Approx. 8mm, teeth thickness: Approx. 3.1mm Package include:1 Piece Wheel Cog(with 1 Piece Fixing Ring).Material: Carbon Steel #45 Size: Cog. B1.37"-24 (about 34.8mm); Lock ring: B1.29"-24 (about 32mm) Teeth: 13T 14T 15T 16T 17T 18T optional per order option Production: Pressed, CNC-machined Threading: Cog (Right hand, Clockwise), Lock ring (Left hand, counter clockwise) Processing: Head Treatment, plated in silver Important: Before you place order, please make sure your hub is the right type for fixed gear cog mount. The hub is supposed to have 2 types of threading at one side, for install of the cog and lockring respectively.