Originally Posted by
badger1
To answer your thread's title question: for all practical/legal/ethical purposes? None.
Not a big fan of science, are you?
Originally Posted by
rubiksoval
The notion that it's "all in the motor" is flat out ridiculous. There are numerous threads with numerous riders' data showing people going extremely quick on extremely low watts. Just perusing Strava can give you hella information on just how slippery some people can be.. Your body position is place number one to start and there are mphs available from there if you have the skill and knowledge and devotion to suss them out.
Yup.
Originally Posted by
Sy Reene
Originally Posted by
Athens80
[Chart from From Velonews and [url=https://cyclingtips.com/2010/04/biggest-bang-for-your-buck-in-time-trial-equipment/]Cyclingtips, snipped]
Those all seem additive?
No, those are differences from one change at a time; some of those things are independent enough so they're additive but there are some items that interact. Chris Yu from Specialized talked about that in
this podcast, along with a nod to aero watts and style watts. I think that podcast also talked about tires/tubes/inflation pressure, but that certainly shows up in the Marginal Gains podcasts. Tires/tubes/inflation pressure don't show up on that chart but they have a *great* bang-for-buck in terms of performance (but zero bang-for-buck in terms of style -- no one can see your tubes or inflation pressure).