Ritchey WCS Carbon Link Flexlogic Seatpost 27.2 400mm 15mm Offset BlackRitchey WCS Carbon Link Flexlogic Seatpost 27. 2 400mm 15mm Offset Black. The Ritchey WCS Carbon Link Flexlogic seatpost utilizes a two bolt clamp thats lighter more compliant and more versatile than ever. The patented Link clamp works with all standard saddle rail designs as well as Ritchey Vector Evo; and Selle Italia MonoLink; saddles with separate adapter. Reversible clamp allows for an additional 10mm of fore aft saddle adjustment FlexLogic