Originally Posted by
nrsmd
Assume tires with a rolling resistance of 20 watts. Now replace with tires with a rolling resistance of 10 watts. What speed increase, if any, can I expect all things being equal?
You can just barely measure a speed difference between a pair of GP5000s and Vittoria Corsa Speed tires which is supposed to be about 10W difference or so. Given the difference in durability and puncture resistance and (especially wet) grip which all heavily fall in favour of the GP5000s, it's not a clear cut decision. I have a wheelset with one and one with the other.
Differences of a few watts between top shelf road tires would, by extension, be even harder to measure without applying more rigorous methods.
Aero wheelset is also a similar difference - detectable on segment times but barely - but it's a more clear cut decision to use one because there's literally no downside to using something like 45mm deep aero wheels except price.