Surly Track Cog 3/32in x 13T Silver (FW2081)

NOTE: Photo serves only as an illustration; may not show the exact model. Surly Track Cog: Track (fixie) Sprockets Designed to spin onto standard ISO-threaded (1.375" x 24tpi) hubs, so they will work with most English, Italian and Japanese hubs, including the Surly New track hubs. The base is 7.4mm wide for maximum thread engagement while maintaining enough room for a track lockring. 3/32" or 1/8" tooth thicknesses and in every size from 13-22T.