LZ22
The Ritchey/Syncros single-bolt seatpost clamp is simple and easy to use, as long as the post is on the bike so gravity assists you). As the bolt pulls the clamp ears against the rails from the side (squeezing them against an inboard stop), the lower lips of the clamp ears follow a tapered surface to pull the clamp down against the rails. Three different clamp pieces are available for standard rails and two different dimensions of oversized carbon rails.