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You can't compare a road bike with a tri bike. The geometry is so different that the rules for one don't apply to the other. Your tri bike will have a steeper seat angle and a shorter head tube. This is putting you in a more forward position and actually shortens your top tube if you measure it compared to your road bike. However, with the shorter head tube you are lowering your handle bars. This is the same effect as lengthening the top tube from a biomechanical riding position. So although the tube is physically shorter, the reach is still the same. Read Dan's articles if you don't get this.
I think you might want to email Gerard at Cervelo on this, but IMO you certainly don't want a tri bike a bigger size than your road bike. Of course realize that different manufacturers can also measure theior bikes differently. Most people buy a tri bike the same size or one size smaller than their road bike .
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