Some counterpoints:

>That study was done with cyclists that, over 12k, put out more power than just about any pro ironman cyclist does, and thus producing more heat as well.

>That study was done in a 102 degF room, much hotter than Kona

>That study was done with a fan producing a wind speed of 6 to 8mph, much less than you would get in kona

>That study was done with a Giro Selector, with the visor on, which is a worst case scenario. One could hedge their bets by taking the visor off, or using a helmet like the Evade

Counter-counterpoint

Humidity? (can't find the full text).

Humidity has a humongous effect on the efficiency of evaporative-convective cooling.

I'd much rather ride 102F in desert humidity than 90F in a Kona sauna.