Safort Dropper Post 27.2/30.4/30.9/31.6/34.9mm Remote Internal Routing Seatpost About this item Package includes 1x 30.9mm dropper post, 1x dropper seatpost lever, 1 x cable, accessories and instructions. This dropper post is designed for frames with internal cable routing and will not fit any frame with external cable routing. Manufactured from 7075 aluminum alloy for strength and durability, this seatpost supports riders weighing up to 400 pounds. There are 4 diameters of seatposts to choose from, 27.2/30.9/31.6/34.9mm, and the travel is 100/125/155/155mm respectively. Note1: Seatposts of different diameters are not compatible with each other, please check the diameter of the original seatpost on your bike before purchasing. Note2: This seatpost is only suitable for common 7x7mm dual-rail bike saddle (steel and carbon fiber). Note3: A small metal part (included) is required for the installation of the cables at the bottom of the 30.9/31.6/34.9mm seatposts, please check carefully when receiving. bottom of the 30.9/31.6/34.9mm seatposts, please check carefully when receiving.