Redshift Sports Dual Position Seatpost 27.2 x 350mm - Black/RedDual position seatpost provides on the fly switch between standard road position and an aero position Linkage design maintains proper leg extension in both positions Aero position: saddle moves forward 50mm, corresponding to approximately 4 degrees of effective seat tube angle change Road position: 16mm rear setback Simple, two bolt saddle clamp with infinite tilt adjustment Patent pending design is legal in all Ironman and USAT non drafting