Zipp Service Course SL SeatpostThe carbon Service Course SL seatpost is specifically tuned to be more shock absorbing than the comfort seatposts on the market, while still passing our strict internal MTB strength test. Flex engineered into the lightweight carbon tube keeps the rider comfortable over any terrain. Better fit means better performance, and if your saddle is out of position, youll waste energy with every pedal stroke. The secure, two bolt clamp makes for easy micro