Just as a follow up to last winters post The World is my Aerolab, I thought I would link to a little video that sums it up nicely. Much more digestible than reading Robert Chung’s full paper (although I encourage that). (edited to add: the part about VE starts at about the 28 minute mark.)
I have spent a fair amount of time helping others get started in doing this. It’s a pay-it-forward type of thing for me.
You do need a power meter to do true-blue Virtual Elevation type testing. And that’s a very versatile and precise method. But, there are coastdown methods you can do to determine CdA and Crr for those who don’t have a power meter, but have some sort of recording type bike computer, such as a Garmin 500. You do need an auxiliary speed sensor, though. Not a big deal.
This BROL post (written by me) gives some step by step details:
Just email me with questions, folks.