Even though I will leave adapters available, I am going to say that the Prologo U-Clip is not all it's cracked up to be. The Fizik clip is much stronger and sturdier than the silly little U-Clip. It's not my part, it's that the U-Clip is just too thin to support any weight without vibrating, I am not going to redesign Prologo's clip either. About all it is good for is something like the Varia tail light. Now the Topeak version, since it attaches to the saddle rails is much studier! I am going to put my Cannondale clip bag back in it's proper place on the U-Clip and continue to use a regular seat post mount for the actioncam.