Having spent the past couple months working on a project testing the aerodynamics of various bicycle components, I've done a fair bit of market research and literature review.
Long story short, bicycle manufacturers don't release any literature on the tests they have carried out, they only release a graph showing the reduction of drag without giving many key parameters to validate their claims.
When I see an advert, with a graph showing how their product is the best and a pretty CFD picture, surely some sort of actual evidence has to be provided for their claims?
What do the ASA have to say about this type of advert? Could I simply contact a bike manufacturer and expect them to give me the information about their claims (I have tried this with one manufacturer, they saithey couldnt give me that information).
Part of the reason I am asking is because it seems manufacturers are wildly over exagertating their performance benefits. My CFD and wind tunnel research, though limited, shows that their are benefits of aerodynmic drag reduction, though I can't replicate anything close to the reductions claimed by bicycle manufacturers.
To get really nerdy, they aren't giving away what Reynolds numbers they are testing at, nor the boundary layer and turbulence methods used in CFD - all of which has a very significant impact on results.