TOPEAK DP SEATPOST MOUNTA MOUNT FOR DROPPER POSTSDropper posts have revolutionized the way mountain bikers and cyclocross riders ride their bikes. With this new technology comes new accessories to enhance your riding experience. The Topeak DP Seatpost Mount is designed to add versatility to your dropper post. It is specifically designed for rear bikepacking bags, is compatible with water bottle cages, and is compatible with Topeak tail light clips. It is made from diecast aluminum and fits upper post diameters from 22 to 27mm. It includes all this shims necessary as well. Features Solid aluminum means it is lightweight and durable Designed to work with bikepacking bags as well as bottle cages and tail lights Compatible with 22 to 27mm upper posts | Topeak | Dp Seatpost Mount | Black | 27. 2-31. 6 Seatpost, Will Work On Droppers