Rear lights typically strap to seatposts with rubber bands or clamp around the post with plastic brackets—solutions that work but look like afterthoughts on a frame you've spent real money on. The Cervelo Rear Light Mount 003 takes a different approach by building the light mount into the seatpost head itself. The system replaces the rear saddle rail clamp on SP18, SP19, and SP20 seatposts with a modified clamp that includes an integrated accessory mount. Your light attaches to the seatpost structure rather than hanging off it.

The kit uses a two-piece design. The primary component is a replacement rear rail clamp that bolts into position the same way your stock clamp does—you're not modifying the seatpost or drilling anything. Once the saddle is secured, that rear clamp becomes a stable foundation for the second piece: an adjustable extension arm that connects via a GoPro-style interface. The extension pivots to let you angle the light where you want it, and the GoPro mount means any light or camera designed for that system clicks right in.

Because the mount ties into the saddle rail clamp, it benefits from the clamping force you're already applying to hold your saddle in place. That makes it more secure than strap-on solutions that rely on friction against a round or aero-shaped seatpost. The light isn't going to rotate or slip down during a ride, and there's no rubber band to stretch out or break over time.... Read More