Fred, I don't remember the exact dimensions but I'm guessing about 1 5/8" at the fades with a slight taper to 1" or 1 1/4" eight inches from the tips. I left the tips 3/4" until after I bent the curves then brouht them down to 3/8"
You can see the complete "build along" on TradGang, pg 25 of the "Bowyers Bench", 11 posts up from the bottom. "Trade Bow, 60" elm..."