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jamesdak - many of those bike have the same saddle but not all, measuring from the center of the saddle for similar seats I think works, I do wonder about the other saddles, I have found how I perch on a different saddle other than my typical will end up with a cm adjustment so that my knee ends up the in same position when the cranks are at 3 o’clock., with a plumb Bob dropped from a sharpie dot on my knee. This is a two person job.