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Interesting article, if a bit involved. Sheldon Brown (of course) has a calculator for gearing: http://www.sheldonbrown.com/gears/.

Due to the terrain here, I have a 50/34 front (compact cranks) and 11-25 cassette., and a preferred cadence between 90-100 depending on the grade or lack thereof.

Sheldon Brown anything gets upvoted by me :) The amount of information and detail of it that man put together about bikes on the internet always amazes me.

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