Shimano, Dura Ace 7600, Pignon fixe, 15D, Pour chaîne 1/8''

Whether replacing a worn-out cog of just changing your gear ratio, you'll want to use the best parts for your single speed machine. The Shimano Dura-Ace Track Cog is a screw-on track cog for fixed gear bikes. It uses the standard 1.37" x 24 TPI threads.