Behind Seat Bottle Cage Rack and Triathlon Bike Bag, Includes Alloy Water Bottle Cage Mount with Bike Bag | Attach Your 2 Bottle Cages and 2 CO2 Cartridges. Includes Rack and Bag Only.

Matches my Valdora PHX2 Triathlon bike perfectly. Had a bottle pop out going over a pretty large bump at a good rate of speed. Added a rubber band to outside of cage to hold a little tighter. Rode same course with no problem and rubber band is all but invisible. Recommend it if you are looking for a rear mount bottle cage holder. attaches to saddle bars nice and tight and has a lot of adjustment for the perfect individual fit.

This is a slick little carrier. I'm not crazy about the light or the inflator, but the mount is well made. Mounting is a bit fiddly BUT, if you mount it as high as you can on the rails, you can still fit a small pack under the saddle. My only gripe is that it's a shade over priced.

Poorly designed. Does NOT fit standard rails. Does not keep cages fixed in place.