i just got my cog today from universal cycles. it came in like 5 days and looks well made. its a surly 22tooth nine spline 3/32" cog. if you are looking for a cog for a nuvinci hub(cuz they dont come with one!) Universal Cycles -- Surly Single Cogs is a good place to get one. in whatever size you need. 17-22teeth for this hub.
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