Thomson Elite Setback Seatpost The Elite Post The legendary design and construction of the proven Elite Seatpost by Thomson, in a layback design for riders desiring a bit more setback. The post and cradle are constructed from one piece of 7000-series aluminum. Please note: Thomson does not recommend the use of shims on their seatposts. Second-to-none quality and construction100% made in the USA! All setback posts feature 5/8" (16mm) of setback About 265g (30. 9mm size) | Thomson | Elite Setback Seatpost | Black | 31. 6 X 367Mm Setback | Aluminum