The Cache cage features a side entry bottle design (to fit all frame sizes), married with a flippable wing for left or right handed use or for mounting on the seat tube (where you need to reverse entry). For downtube mounting the design has been optimized for the recessed section on the Spark but will work with all bikes. One area Syncros paid particular attention to was bottle retention and their engineers conducted extensive testing to ensure that your bottle is kept on your bike for when you need it.