Mark- I had a zero offset Thomson before the setback, and to be honest thought I was pretty close to perfect then. I bought the setback just for peace of mind when it came to maxing out rail tolerance. When I went "setforward" I found I could put more power down for a longer period of time over my pedals and ended up in pretty much the same spot on the rails!
The saddle used for the fitting was different, and in hindsight I should have used my own, but the shape and dimensions are practically identical. Crank arm length (167.5) was matched as well.
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