Comparing Bicycles

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How can I compare the relative performance of bikes with different
wheel sizes and gear ratios? I am particularly interested in
estimating how my existing 21 speed 27" wheel hybrid would compare to
various 20" wheel 7 speed configurations found in folding bikes and
some of the new comfort bikes.

Larry Crowley wrote:

> How can I compare the relative performance of bikes with different
> wheel sizes and gear ratios? I am particularly interested in
> estimating how my existing 21 speed 27" wheel hybrid would compare to
> various 20" wheel 7 speed configurations found in folding bikes and
> some of the new comfort bikes.

See: http://sheldonbrown.com/gain

and: http://sheldonbrown.com/gears

Sheldon "Numbers" Brown
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