Originally Posted by
CV-6
I have to wonder if the differences seen on these rolling resistance tests are actually noticeable on the road or just bragging rights. Kind of like which hub spins the longest. Do you really notice a difference?
Tire style and quality has a significantly larger performance impact than most other sorts of components choices on a bike. Whether it's actually significant is a matter of opinion. My gravel bike sped up by about 1mph when I switched to Rat Trap Pass ELs from the previous slicks that were on it, which had a basic 30TPI casing and used a puncture-protection belt under the tread. I considered that a very large performance difference.
Bearings are much less significant... a different order of magnitude in their effect.