Sounds like they err a little on the “lower” side of things, Joshatzipp - "Honestly, doing all of this has basically taught us that for most courses and most conditions, solving for peak wind angle and using the assumption that the angle probability fits between 0 and calculated peak wind angle as a bell curve, is pretty accurate for the simplicity of the calc Even moreso, the head tube probe generally shows on the lower side of the prediction. I’ve talked at length with Mark Cote formerly of MIT and now at Specialized about this very topic, and he has built his own data acquisition system and probe, and they seem to be replicating many if not all of the trends that we have spent the last 10 years working to define, and the data we have collected is totally in line with what Andrew was doing before that. I think that the fact that Specialized set out to optimize the new Shiv around the 12.5 degree data point says a lot (coincidentally the same optimization angle we designed the 808 for in 2004). The good news on the aero side is that we achieve great numbers at 12.5 or 15 by controlling airflow to maintain flow attachment, that makes all the points between 0 and 12.5 as low drag as possible for the surface area of the part…this is why an 808 is identical in drag to a disc between 0 and 12.5 and the 1080 matches the disc between 0 and 15 degrees. "
http://forum.slowtwitch.com/...post=2476082#2476082
“So back to Hed. He’s in the camp saying 26 degrees, and we say 26 is the max, but if I run that and plot the curve, 13 is the most likely, it’s the highest probability. So that’s where we really diverge. What we found, and we backed it up with this headtube mounted probe that we rode the heck out of and collected the data for months, real world wind angle probability falls between 7 and 15 degrees. If you’re slower it runs higher and vice versa. It’s very rare that you’re going to have a most likely wind angle of 20 or higher, 'cause that means your peak wind angle is going to be 40 or more, and to get there you either have to be going really slow, or have really ridiculous wind speeds, at which point most people are going to opt for shallow wheels.”
http://nyvelocity.com/...gineer-josh-poertner
Thanks for digging that up!