I've been using Bontrager cages for over 8 years behind my saddle and never had a single bottle launch, no matter what bottles I used. On my other bike I started using a different brand and on some rough roads I had a few launches, so I bought these thinking that BT knows how make a good cage. So I installed these behind my saddle and on my very first ride after 20 m of riding, going over a very small bump both bottles flew out. I turned back and again in a few meters on a negligible bump both bottles were launched again. I may try them on the down and seat tubes, but they are definitely worthless behind the saddle. My old BT cages still function perfectly on my other bike. Too bad.
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