Are you looking for a spin on or slotted cog for your single speed or fixie? Well, we've got plenty in stock. We have a few sets with different cog sizes available, but we also have plenty of single cogs available from Surly, in a number of sizes. Of course we also have the requisite lock rings in stock if you're riding a fixie.
We especially like the nice wide base that Surly provides on their slotted cogs, so your freehub body doesn't get torn to pieces. And the price, at around $30 a piece, doesn't hurt either.