Zipp SL Speed Seatpost has become a favorite of pro road and cyclocross racers because of its light weight and dependability.Features-UD carbon post, head and clamps-Minimum insertion length is 100mm-Single bolt adjustmentItem Specifications-Defined Color:Black-Weight:170-Offset (mm):20-Diameter:27.2-Max Height:240-Color:Carbon-Min Height:100-Material:Carbon-Clamp Style:Standard Rails-Clamp Style:7x9 Rails-Length:400