The Arundel Tri Clamp is one of our favorite ways to add additional water bottle storage to your bike. The Tri Clamp accommodates two standard water bottle cages and fits on normal (round) seatposts as well as aero seatposts.
Installation is easy. The only tool necessary is a allen wrench.
On long rides, there’s nothing liking having an extra bottle or two. Cages not included.