Originally Posted by
Bacciagalupe
Not sure what you mean by "tire scrub," unless you mean "rolling resistance." I don't think increasing lateral stiffness will reduce rolling resistance; increasing vertical compliance
might drop it a tad, but probably not by an appreciable amount in most circumstances.
Until someone does that, I wouldn't worry too much about it unless you're in a highly competitive situation. Go with how the bike feels, rather than a parameter whose effect is difficult to quantify in the first place.
Motorcycle and bike tires are made to steer when cambered (angled from front view) one way or the other. This frame deflection due to pedaling tilts them slightly back and forth which creates a slight amount of steering back and forth. I'm calling that tire scrub.
For the record, this observation was on my old steel bike as the newer C'dale is in pieces (closely linked to bad wing and me being on rollers in the summer). I've never felt that there was a hill of beans difference between the 2 bikes in terms of performance. I race the C'dale because it's expendable.