Surly track cogs are 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 thread base is 7.4mm wide for maximum thread engagement while maintaining enough room for a track lockring to thread on. Like their cassette-splined cogs, these are made from machined, heat-treated and chrome plated SCM415 CroMoly steel, so they are tough and long lasting.

Features :

Surly cogs are machined from SCM415 CroMoly steel, then heat-treated for toughness and chrome-plated for surface hardening and enhanced chain lubricity.

Surly cogs will work with 6-9-speed 3/32" chains, although they recommend the inherently updated quality of an 8 or 9 speed chain.

Choose your size from the available options displayed in the drop down menu above. Each Surly cog is sold separately.

Weight : 40 - 70 grams