Zipp Service Course Seatpost . Better fit means better performance. If your saddle is out of position, you’ll waste energy with every pedal stroke. That was the foremost consideration in creating a secure, low-profile clamp for the Service Course seatpost that allows the saddle to slide farther back along the rails. This unique design also offers 20mm of setback and micro-adjustment with downward-facing bolts that are accessible even if the saddle shell covers the top of the seatpost For high strength, low weight, and efficient use of every gram, the shaft and head are 3D-forged from a single piece of 7075 aluminium – not bonded together. The Service Course seatpost weighs 270g (350 x 27 2) and is available in 350mm length and 27.2 and 31 6mm diameters Features: Weight: 270gDiameter: 27.2/31 6Length: 350mmSetback: 20mmWeight limit: 300lbsBuy Zipp Components from Chain Reaction Cycles, the World’s Largest Online Bike Store.