I was very curious about the measurements malaholic described on the Ergonova -- I did try a similar 3T handlebar on a Cervelo and I found it so comfortable (probably not my size, just testing the bike). So, I sent the question about how they measure to 3T. This is the response, which I found very interesting and wanted to share here:
"The ERGONOVA has a 2 cm flare at the drops. This means a 44 cm bar is 42 cm at the hoods, because the bars are measured across the center of the drops. The Pro Team and LTD all have the same nominal shape and dimensions.
The flare allows the drop to be reduced in depth without closing the form of the drop and restricting the grip shape. ERGONOVA has exactly the same drop shape as ERGOSUM but the flare reduces the drop compared with ERGOSUM. (It also has a shorter reach.)
A little back ground; ERGONOVA is designed for enhanced comfort. When designing it, we consulted with sports scientists and coaches, and orthopedic surgeons specialized in sports medicine. They suggested riders should choose a slightly narrower bar than is traditional.
Their reasoning goes like this: stand upright and hold your arms out in front of you, with shoulders relaxed. Your hands fall naturally at the width of your shoulders, or slightly wider. This is the traditional sizing for your bar.
Now bend forward as if to touch your toes, keeping your shoulders relaxed – your hands now naturally fall closer together. This bent condition more closely resembles your position on the bike. The traditional sizing, on the other hand, means your shoulders are held in a wider stance than is natural. This wastes energy.
The traditional argument for a wider stance is that closing the arms at the shoulders constricts the lungs and inhibits breathing. But if you study the skeleton, you will see that the shoulder joints are well above the rib cage and do not constrict the lungs.
The traditional 'wisdom' on sizing is disproved by sprint and endurance track riders, some of whom have larger physiques than most road riders. Yet they are now tending to use bars as narrow as 34 cm, without constricting their breathing. Look also at road riders' TT position – they produce max power over an extended period with their arms completely closed at the elbows. Triathlon riders maintain this position for several hours, yet they can run straight after dismounting the bike, without any ill-effect on oxygen uptake from their lungs.
As a result, we recommend you specify the same size ERGONOVA as your 'traditional' size. The 2 cm reduction in width at the hoods will, in our view, enhance your all-round riding comfort.
This recommendation may not suit every rider – bar choice is particularly personal, regardless of the 'science'. If this is the case, you may prefer to consider the more traditional ERGOSUM bar from our range."