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Thanks, that's a great spreadsheet, which it turns out, on trying to save, that I already had saved!
It does use 1/2 the stem stack + headset + spacers and it transpires the head tube angle makes quite a difference.Confirms the 55cm would need at least 130mm -10/12 stem and ~8cm spacer stack (somewhat ridiculous) whereas the 58 would work nicely with a 120mm -10 stem and minimal spacer stack, time to unwatch the 55cm that is on the bay!
Long arms and legs, with a short torso, seems to necessitate for 'pro' length stems.
sidewinder-
Yep. In reality, pretty much all stems are 40mm high, +-4mm, so when it comes to replicating between bikes it's not really a variable that makes much difference.
I'm long legs, short torso short arms, a true dino, which means I end up needing large frame size to get the stack I need, and then a relatively short stem (100mm) to get the reach right.
Hovis
I've been blindly using this spreadsheet for all my bike indulgences over the last few years. Comes out perfect every time.
http://bb2stem.blogspot.co.uk/2011/10/stack-reach-calculator-v100.html