Better fit means better performance. If your saddle is out of position, youll waste energy with every pedal stroke. That was our foremost consideration in creating the Service CourseR seatpost. The secure, low profile clamp allows the saddle to slide farther back along the rails, and with 0 mm and 20 mm setback options, its possible for nearly any rider to achieve the perfect fit. This unique clamp design also features downward facing bolt heads that allow micro adjustment of the saddle even after it is mounted. For high strength, low weight and efficient use of every gram, the shaft and head are 3D forged from a single piece of 7075 aluminum not bonded together. The Service Course 0 mm setback seatpost weighs 260 g 330 x 27.2 and is available in 330 mm length and 27.2 and 31.6 mm diameters.