Join Date: Jul 2005
Location: Davis, CA
Bikes: 07 Madone SL, 06 Madone 5.5 & 04 5500
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I ride a 56cm (trek) road bike, but my TT bike is a 55cm (the company calls it a 57). The positiing is very different on a true TT bike. I'm directly over the pedals, the seat is much farther forward and your weight is distributed much differently.
Generally, two cm shorter is about right, but it would depend on your body type. And as I mentioned above bike companies don't all size their bikes measuring from the same points.
Just Do It..