FSA Energy SB20 Seatpost - 27.2mm - 350mm - BlackFSA Energy SB20 Seatpost 27. 2mm 350mm Black The high quality FSA Energy setpost consists of a 3D forged and CNC machined AL6066 head and shaft with chromoly hardware. Further equipped with FSA's easy adjustable 2 bolt clamp. The 20 mm setback of the Energy seat post allows a perfect position even on small compact frames. AL6066 tube with forged alloy head 1 bolt adjust saddle clamp for simple set up Chromoly hardware Length: 350mm Diameter: 27. 2mm