Originally Posted by
skichese
Thanks so much for the info--that definitely helps! My only question is then, if the cog won't fit on a campagnolo free hub or on a shimano free hub ...what does it fit on?
It might fit the old 8s Campy spline. To my knowledge there are only 2 spline patterns in current use. The 9-11s Campy like yours and the Shimano pattern that they've been using for a long time now. If you have a Shimano hub and it doesn't fit that (make sure you try various positions because there's a "king" spline that only aligns in one place.
Otherwise you should email TA a photo and ask them (or whoever you bought it from).