If calculators are always wrong, why use one? Actually, it is you who is wrong. "Most saddles give you much more than 10mm adjustment in either direction. Zero offset seatposts are becoming very available and I've seen Nashbar blowing out some very nice FSA zero offset posts for less than a third of their list price. If you have an "aggressive" fit in mind I would seriously look into one. If you will study your own chart that you attached you will see that it is very easy to get 50mm of "setback" with a zero offset seatpost because the frame already has a significant amount of setback built in. Setback, as they define it is the distance between the saddle nose and the bottom bracket. On a plumb line, of course. You're on your own with the stem. They are cheap as well. Almost cheap enough to buy several, in 5mm increments and simply slap on the one you feel like that particular training day. "Arggg, I feel like getting stretched today, where's that 130mm Salsa..."

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