Originally Posted by
carleton
Wow. I wondered about what happened to their front disc. I've only seen a couple in photos from US track racers around 2009 or so.
Do you have a link to a source on that info?
Zipp says it on their disc timeline page at the bottom: http://www.zipp.com/support/identify/discs.php#sm.000049usuaw78cw9zrf126frj59dw