Time Trial / Time Trialling / TT

Be interesting to see proper tunnel results..

"The second surprise was that an aluminum Roval wheel (not a deep section wheel) with a conti tire (GP4000S with chili compound) was significantly faster than a cheap 50mm carbon rim with a conti sprinter (chili compound, not the gatorskin version). It's one reason why I really don't encourage people to buy cheap carbon wheels off ebay."

http://robbellracing.blogspot.co.uk/2012/02/using-golden-cheetah-aerolab.html

That's interesting data- he'd need to repeat that test with the tyres swapped to make it meaningful though surely?

Otherwise it's possibly rolling resistance rather than aerodynamics.

If it is the case that a 50mm blunt-V is worse than a standard 24mm profile rim then it would be interesting to see why, preferably in the wind tunnel as you suggest.