cogs ISO COG 21T
We produced this cog some years ago and is been re-stoked recently by popular demand.
ISO COG, so it can be used on iso hole of the mtb hubs to make a fixed gear bike or to be built on our special shimano carrier to create a super strong single speed cog that will prevent chain failures.
to be used with 3/32" chains or 1/8".
cog only. no carrier included