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Ed, look at this thread on TTF, plus there are a load of other threads too. Basically as Xav says, ride a short loop at a known power and then use the aero-lab feature in golden cheetah to estimate CdA. As I understand it the real important bits are a good bit of traffic free road with a good surface and a sensibly designed testing protocol.
Re. Wales, I did have a cheeky look and I'll reply in the Tri thread so as not to get too SLVLSS in here.
ewanmac
Sam
Hmsorry for newbie question but how do people calculate CDa?
Also @ Ewan - have you looked at my bike leg from wales? My ftp was about 220 at the time and plans were ruined by the brutality of the swim but it should give you an idea of what you need for a decent bike leg.... That said there always seems to be one horrific element of the course in wales!