If you find that would be awesome, as much as I should be willing to spend $60-$75 dollars on a cog for the bike I ride the most, it does niggle a bit.
The good news is I found it, the bad news is it's a 13, sorry!
I was a bit surprised by the idea of a 12T DuraAce. Suntour used to make a 12 when they still existed and made track parts, Sugino do a 12T too.
@Colin_the_Bald started
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If you find that would be awesome, as much as I should be willing to spend $60-$75 dollars on a cog for the bike I ride the most, it does niggle a bit.