CdA roadbike with aerobars

[isaac]

Hi,

I am about to install aerobars on my roadbike and do a new cal. ride.
The Est Aero gives a CdA of 0,255 for TT position (My body is 71kg and 180cm). It seems to be a little low.
Is this setting for a complete TT-bike or can I use this CdA for a roadbike with aerobars also and get reasonable watt readings without coast downs?

Regards,
Jonas

[lorduintah]

CDs take such little time - why not use real data?

Or - what do several positions of possible calculated CdA values give - you could use a value in between if you see a large difference. There are always wasy to get around some things, but know that real measurements done right are representative of your real world setup.

Tom

[isaac]

Yes, I definitely will do coast downs later on, and only use the Est Aero as a baseline.
I have done that with both hoods and drops position earlier with good results, only minor adjustments after coast downs.

/Jonas