Travel: 50mm Length: 350mm (Maximum extension of 300mm height) Compatibility Notice: This suspension seat post is only compatible with VTUVIA e-bike models. Please verify your ebike model before ordering to ensure proper fit and performance. Select VTUVIA ebike models will need to use the included additional adaptor for a secure fit. These adaptor sleeves come with your order. Installation Instructions: SF20/SF20H/SK20/Kangaroo : Direct installation without using any other adaptor sleeves provided in the package. SN100/SJ26/Reindeer/Giraffe/Gemini/Zeal : Place the adaptor sleeve ( 27.2-33.9 ) into the frame first, then install the seat post into the frame. These adaptor sleeves come with your order. CMB/SX20 : Place the adaptor sleeve ( 27.2-28.6 ) into the frame first, then install the seat post into the frame. These adaptor sleeves come with your order. Note: All accessories are non-refundable and non-exchangeable.