The key to the Arundel Tri Clamp is the use of a “V-block” design with convex inside surfaces. This helps it fit a variety of seat posts, round or aero shaped. The Tri Clamp stays securely fastened and the bottles are easy to reach. Plus, it’s affordable.

Weight: 117 grams without cages

Hardware included for a round or aero post

Cages not included…