I just tried fitting a newly-bought fixed cog (a Miche) to my trusty ENO hub on my mtb ss, and the problem is it didn't fit. The two lockrings that come with the sprocket (one for the large diameter area and one of smaller diameter to lock it in place) seemed to be of slightly too wide a diameter and even though i could thread in the larger diam one in, it was still a bit ratly within the thread. The smaller one didn't even engage.
The shop guys were perplexed as they said there is only one standard for track cogs (and I think they should know, we have a velodrome here in South London). I had to give the sprocket back.
What brand of fixed sprocket do you guys fixies ride on an ENO?
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