Originally Posted by
JohnDThompson
AFAIK, Campagnolo only made rings up to 57T, so it's a third-party ring. Stronglight and TA used to offer custom rings in just about any size, and left the cut-outs to the customer.
Well it appears to be 54T you can't rule out thatit's a Campy based on number of teeth. However, it appears that the cutouts are skimming the markings, so it probably wasn't sold that way.