Bearcamp,
I went back and re-read my earlier post and realized that I typed "camber" when my brain was thinking "caster" I sincerely apologize for any confustion my typo caused in this discussion. "Caster" - the fore/aft tilt of the spindle, measured relative to the ground; and "Camber" - the in/out tilt of the spindle/wheel relative to a flat plane through the centerline of the vehicle. I corrected my statement, and again apologize for confusing the discussion.

Quote Originally Posted by jerry clayton View Post
No--he means camber---its already built into the axle and is what it is from combo of axle ends and spindle angles---

Roger--seems to be something about my reply???
Jerry, as noted above I made a terminology error. As I look at a scale sketch of a traditional hairpin setup and the arc's descrbed with axle movement it's clear to me that the caster increases/decreases with movement of the axle, but the change is relatively small because both the top and bottom mounts on the batwing follow the same arc radius. However, if the top bar is longer (let's say 2" longer for point of discussion) then the batwing mount points describe two different, parallel arc's, and the measured caster angle increases more on an upswing, and decreases more on a downswing than the change seen with equal length (or very nearly equal length) top/bottom bar lengths. In my head I looked at the angle of the line through the batwing as opposed to the actual caster line, and it muddled my brain a bit. When I did a sketch it became clear. Bottom line, I think referencing the R&C tech description provides a clear, concise path for Bearcamp, and he's getting good advice about re-working his frame.