Surly track cogs are designed for fixed gear applications and are compatible with most English, Italian and Japanese hubs, including the Surly New Track Hubs. The thread base is 7.4mm wide for maximum thread engagement while maintaining enough room for a track lockring to be threaded on the outside.

• Compatible with standard ISO-threaded (1.375″ x 24tpi) hubs
• Machined from SCM415 Chromoly steel
• Heat-treated and chrome-plated
• Works with 3/32″ or 1/8 chains
• Available in 13t22t