I hate to have to dredge this thread back up. But I have an update.
This is a hoop that I purchased from princess bike. It replaced the hoops on the set of wheels that failed last year from Carbon Zone. I have 1500 to 2000 miles on this wheelset after rebuilding it with these new hoops. They are 55mm deep, tubeless U shaped x 25 mm wide. I last rode them on thursday, they were fine. Saturday morning it exploded after pumping it up. 6 months old. Contacted Candy @ princess bike. She is going to warranty the hoop if I pay shipping ($65.00)