Originally Posted by
waffenschmidt
To be honest, I'm taking them at their word, as I'm not sure exactly how setback is measured. All I know is I was worried about the limited ability of the Brooks rails to allow the seat to be moved back, and I am currently in about the middle of the possible range of adjustment. I now have about 3/8" to 1/2" of adjustment available in both directions if I need it. This is on a Surly Cross-Check.
Another option is the classic American Classic seatpost. It has one clamp bolt and one angle adjust bolt, and the top clamp is very narrow. So the saddle can be slid back farther than the edge of the lower clamp. The risk is that in the extreme rearward position the saddle rail is supported over a width less than for say, a Campy Two-bolt or a Thomson. For both of those the upper clamp is as wide as teh lower clamp, so the saddle rail can only be supported over the entire clamp width. If your a lard-butt like me, I'd worry about over stressing saddle rails. But it should be ok for racing snakes or smaller folks.
Road Fan