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@scotland
Sorry to clarify, do you guys mean concave/convex relative to the ground? I think you need a point of reference to describe something as concave/convex. my back sometimes feels concave sometimes convex. Buffalo Bill described a "natural S shape", does that mean one part of the back concave and one part convex? If so which part is which. Thankx, I'm trying to sort out bike fit and posture too.