Wolf Tooth Resolve Dropper Seatpost - 30.9, 160mm Travel, Black, Rev 1The Resolve Dropper Post uses a unique, proprietary design with the patented Resolve self bleeding cartridge at its core. Any air that gets into the fluid chamber is automatically purged with every up down motion, which means it never sags so there is no need for manual reset or purchase of new cartridges. It has the shortest stack height of any dropper post at 32mm and is one of the lightest dropper posts on the market when looking at grams per