For almost everyone, you'll
find that one leg is longer than the other. If the
difference is as slight as a half centimeter you probably
needn't worry, ut at some point you'll want to make your
bike fit. There are three major ways to adjust your bike.
If the difference is mostly
in your thighs, you'll want to compensate in your crank
length. It isn't easy or cheap to order an odd crank of a
different size, but it will do the trick.
If your lower legs are
different, the pedal cage height is the measurement to
change. Shimano makes drop-center pedals, which can be
fitted to some cranksets. The shorter leg uses a
conventional pedal, possibly using a an adapter in the
crankset.
Another option is to use
orthopedic pedals set to different cage heights. France's
T.A. makes a set, and a good bike shop can order them for
you.