The Wolf Tooth Resolve Dropper Post is the first dropper post to use a self-bleeding cartridge. It has the shortest stack height of any dropper post on the market, has a short insertion depth, is one of the lightest dropper posts, and is completely serviceable at home via the Wolf Tooth Right to Repair program. Self-Bleeding Resolve Cartridge At the heart of Resolve Dropper Post is a self-bleeding cartridge that removes air from the fluid chamber with every actuation. All dropper posts can get air in the chamber, which leads to sag and squish. Resolve Dropper Post is the only dropper post that purges air from the chamber, which means youll never need to buy a new cartridge as you do with all other dropper posts. Shortest Stack Height The shortest stack height of any dropper post means that Resolve can get your saddle lower than any other dropper post. The lower your saddle, the more room you have to maneuver your bike on drops and techy descents. Weight and weight per travel is equal to the best Resolve Dropper Post is one of the most lightweight dropper posts on the market when it comes to grams per millimeter of travel. Its as much as 26% lighter than other dropper posts of the same travel and size. Short insertion length When a dropper post has a short insertion length, longer travel options are unlocked for more bikes. A short insertion length is vital for smaller bikes, frames with curved seat tubes, and frames with seat tubes that have bottle bosses. Travel Reduction with Spacers The travel length of your Resolve dropper post can be customized at the time of order to suit your bike and saddle height. Simply select the number of travel-reduction spacers you would like to have installed when ordering and they will be installed by a Wolf Tooth factory technician before shipment. We also sell spacer kits separately for those who would like to have the adjustment made later by their local shop mechanic. If you are comfortable with working on suspension components, you may be able to complete the installation yourself. Compatibility Compatible with bike frames that use 30.9mm or 31.6mm diameter seatposts with internal cable routing for dropper posts. A 31.6mm diameter post with a seatpost shim can be used for bike frames that use 34.9mm diameter seatposts. Shims are NOT included with the seatpost. The minimum insertion depth is clearly marked on the Resolve Dropper Post lower tube and varies between 90 and 140 mm. Always follow the minimum insertion depth recommended by your bike frame manufacturer if it is greater than the number marked on your dropper post. Minimum insertion depth varies by travel length and is specified on the Specs and Dimensions page. The longest travel dropper post that will fit you and your bike can be determined using our dropper post length calculator tool. Spacers can be installed to reduce the travel of the dropper post. Custom built dropper posts can be purchased with spacers installed at the factory. If your dropper lever routes the cable head at the remote lever on handlebars you will need a knarp cable barrel found in our replacement parts. Compatible with any ebike that uses a conventional dropper post mounting and actuating system. Specifications Included in box: Dropper seatpost, cable and housing kit, cable barrel Weight (post only): 125 x 30.9 - 440g, 125 x 31.6 - 456g, 160 x 30.9 - 490g, 160 x 31.6 - 513g, 200 x 30.9 - 544g, 200 x 31.6 - 563g Stack Height (Extended Length - Travel): 32mm Saddle Rail Clamp Bolt Torque: 6Nm Seatpost Clamp Max Torque: 30.9mm - 4 Nm, 31.6mm - 5 Nm Rider Weight Limit: 120 kg / 264 lbs.