The TranzX YSP19 Dropper Seatpost features 125mm of smooth travel and a 30.9mm diameter, ideal for mountain biking. Its external routing design simplifies cable management, and the hard anodized black shaft finish provides durability. The included Up/Down Dropper Lever allows for convenient seatpost height adjustments during your ride. Enhance your biking experience with this reliable and efficient dropper seatpost.