For a roaring good time, play around here:
http://sheldonbrown.com/gears/
Plug in the numbers that you want to compare. I make up a wacky front crank so I can compare (30, 34, 39 for example) so I can see what I lose or gain with different components.
Shimano and Campy have different limits, and I'm not sure Shimano has a cassette comparable to my Campy 13-29. So, do some more homework on what's available in the components you are using.



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