The slanted tubes on the bike did not provide enough space for using of a large water bottle with a traditional water bottle cage. This cage resolve the problem because the bottle slides in horizontally. It holds the bottle securely and it is easy to slide inout.
This is an excellent side entry bottle cage. It's lightweight, holds bottles securely, yet it's not difficult to get them in and even easier getting a bottle out. I find the long mounting slots to be particularly brilliant, as it allows a higher or lower position on the frame. I needed 3 right-hand cages for a road tandem (they all mount to the lateral tube) since it was tight getting large bottles in and out with standard cages given the frame clearances. My only complaint about these otherwise wonderful cages is that they don't hold the bottles centered on the bike frame. The tops of the bottles protrude further on the right side of the frame on these right entry units. It seems to be a design flaw that should have been discovered in prototyping. Maybe it's not noticeable on small bottles, but with tall bottles, it's quite pronounced. I really hate to give this outstanding product less than five stars, but this is a bothersome niggle to me- I notice it every time I look down while riding, and I don't know of a good way to tune it so it sits centered (and shouldn't have to). I don't want to return them, as I feel they are the best side-loading cage out there, they are simply one small step from perfection.