Some here are not clearly distinguishing between absolute and relative V02max. Sprinters and TTers are likely to have a higher absolute V02max than climbers. For the latter, relative is more important, because it reflects power/weight.
I think a value of 80-85 for relative V02max, assuming that’s what it is, is very good, though certainly not off the charts. Keep in mind, though, that there is more to success than that. It seems McGee had a V02max of 89, but he not only never won a GT, he never even contended for them. I remember back in 2002 or so he had the great fortune to get in a break on a bad weather day, and ended up the stage about 20-30 minutes ahead of all the contenders, including Armstrong. He couldn’t hold that lead past the first few mountain stages. I also don’t recall the guy claiming to have a 94 relative V02max winning any Tours.
The main significance of V02max is that it allows us to estimate a ceiling on performances. If you refer to
Alex’s power charts in the Critical Power study thread, you see that in the best case scenario, with very high efficiency (23%) and lactate threshold (90%), a rider with this V02 max could put out 6.1 watts/kg. Froome apparently exceeded this on Ax-3, at about 6.4, though that was about a 20 min. climb, whereas the FTP calculated from these curves would be for a longer period of time (maybe an hour, but from what Alex has said here, maybe less). In any case, based on Alex’s estimate of 90-95% difference between FTP and power at 20 minutes, that 6.4 watts/kg value would indicate an FTP of between 5.75-6.1 watts/kg. Froome had values in the low end of this range for his 40-50 min climbs up Ventoux and ADH, so these climbs are consistent with the FTP estimated from Ax-3.
However, there are reports that GME is inversely correlated with V02max, or at least, riders with high efficiency tend to have lower V02max. And if we consider a lower yet still reasonable efficiency (21%; according to Coyle, this is what Armstrong had pre-cancer) and lactate threshold (85%), this would result in much less power, about 5.3 watts/kg. Froome has clearly exceeded this value on multiple longer climbs, e.g., Ventoux and ADH. If we assume a 90% lactate threshold and an 85 V02max, Froome's times on these longer climbs indicate an efficiency of about 22%.
In light of this, it would be very interesting if the Froome camp would publish what is known about his GME and lactate threshold, though I’m not holding my breath. Keep in mind, however, that even if his testing results are compatible with his recent performances, the issue of why his performances prior to 2011 were so much poorer remains to be resolved. As discussed here earlier, his TT times suggest about a 15% increase in FTP from pre- to post-2011.
Also like to see some data for Contador and Horner.