ZIPP SERVICE COURSE SL SEATPOST, C1Zipp's redesigned Service Course SL seatpost is specifically tuned to be more shock absorbing than "comfort" seatposts on the market. The seatpost still passes Zipp's strict internal MTB strength test, but provides compliance that is paralleled by none. Flex engineered into the lightweight carbon tube keeps the rider comfortable over any and all terrain. Features Round and square rail compatible Unidirectional Carbon post with 6061 Aluminum clamp0mm and 20mm setback options Two-bolt clamp makes for easy micro-adjustments of saddle position SPECIFICATIONSMaterial Unidirectional Carbon, AL-7050Diameter25. 4mm, 27. 2mm, 31. 6mm Length400mm Setback0mm or 20mm Saddle Rail Torque7 Nm Min. Insert Length100mm | Zipp | Service Course Sl Carbon Seatpost | Black | 27. 2Mm, 20Mm Back, 400Mm, C2