Track teeth.
When you need every watt to go into the wheels, no name is as trustworthy as Dura-Ace. Their track cog threads onto standard 1.37" x 24 TPI track hubs and is available in multiple sizes to give you the right gear for the job.
NJS approved. Compatible with 1/2" x 1/8" chains.
Cassette Type: Freewheels/ Fixed Cogs
