Key features - Reflector mount for first and second generation Speed Concept seatposts - To use with a Bontrager Flare, use with the Bontrager Flare Horizontal Mounting Kit (sold separately)

Product details: - Fits all Flare tail lights - Works best with 27.2 - 31.6mm seatposts - Includes 16-degree offset for optimized use on seatposts