KOM's Radar Seat Mount provides a strong and secure mount for your Garmin Varia RTL510, Garmin Varia RTL515, or any other rear-facing device utilizing the Garmin quarter-turn system.  

Utilizing the ATOP dial system, the Radar Seat Mount quickly and easily adapts with the turn of a dial to fit a variety of seatpost diameters and geometries: 27.2mm, 30.9mm, 31.6mm, D cross-section, or aero cross-section.

NOTE: Not compatible with the Garmin Varia RCT715