The Answer A-tac stem is an interesting conversion piece. It was designed by FTW which stands for Frank The Welder, a famous welder who worked at Yeti during the companies early years. He is most famous for welding up the first Yeti ARC ever with a lightweight Easton aluminium tubeset. You would think that the A-tac is a lightweight stem, but it is not, even though it is almost full alu constructions (with heavy steel bolts). Answer was a motorcycle company that also made the Manitou fork and Yeti used both Manitou forks and Easton tubes for their stuff. As with most components from 1991-1993 it looks totally bad ass on any hardcore frame from those days and maybe thats all that matters.