Originally Posted by shecky
Sheldon Brown recommends against Surly cogs. For whatever reason, they weren't up to snuff. However, it seems Surly may have recently redesigned the cogs, as was hinted at on thier website.
i guess surly had new track cogs at interbike this year. i think a problem with the old ones is the flange was too thin and when tightened down, a lockring wouldn't really mate up with it very well to hold it in place. the cog could unscrew a bit before coming in contact with the lockring.