. So that leaves improved aerodynamics and that is either self generated or moto generated. I'm going with the camp of Moto assist.
Matt Bottrill is obsessed with drag and aero. Friends of mine ride against him (I am not in that league, or even same bit of road!)
As a pure TT cyclist they take it to a different level than triathletes, not having to run afterwards.
He also believes that triathletes should train as if each discipline is separate, using the best know ideas for each. (at least he used to) rather than swim-bike-run
If Tim Don is working with him there is likely significant input/change on this parameter.
There is inherently skepticism when sudden improvements in biking speed come from the leader on the bike in a race. It has been that was for 30+ years. In Kona they have fixed that problem ....other lower tier races this is not always the case. A great example was Ivan Rana's IM Austria bike split and win a few year ago. Next year, Marino shows up and takes the moto with him and suddenly Ivan is 15 minutes slower. It's not Don's fault, Ivan's fault or Marino's fault if they benefit from the moto....it is the race organizer....as Monty said, something along the lines of, "it's not my fault if I am leading the race and the moto does not have enough power to get out of my way".
Look at what Pubes posted above. Either Don gained watts, got more slippery than Rapp while generating similar watts as Rapp, or he got to push less air cause the moto was too slow. I'm tending towards the last one simply because this is a completely outlier performance for Don relative to his historic performances. I am a fan of the guy, so hold zero ill will. HE SHOULD DRAFT THE STUPID MOTO IF IT CAN'T GET OUT OF THE WAY!!!
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Whiteface Hill Climb + Epicman Lake Placid 3k/180k/21k June 9/10 2016, Epicman Tremblant 10k/260k/42.2k 15/16/17 July 2016