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Laprade Seatpost
From WikiPedalia
Laprade was originally a brand name, but has become a generic term for seatposts with a built-in clamp that uses a vertical Allen bolt to clamp the saddle rails. Typically,, the tilt of the saddle is adjustable by loosening this same bolt so the convex, toothed underside of saddle-clamp assembly can be slid backward or forward on a matching, concave, toothed surface. This type of seatpost is much easier to adjust than the classic Campagnolo two-bolt seatpost, but can be adjusted only in (small) steps.
