On Tue, 25 Jun 2019 18:36:11 -0400, Frank wrote:

Macadam is a little rougher than asphalt and more abrasive surface will
give more wear but stuff I read did not quantified amount of wear.


Thanks Frank, where I never knew there was a difference between Macadam and
asphalt.

What would you call this stuff I just showed Clare?
https://i.postimg.cc/SNJHYT9s/mount45.jpg

Tire rotation and alignment are probably much more important.

The problem is that these vehicles ALL have the same wear patterns to the
OUTSIDE edge, where a tire "rotation" won't help unless we flip the tire on
the rim, am I right?

BMW: https://i.postimg.cc/g004XCLW/mount37.jpg
Lexus: https://i.postimg.cc/8zVxVHVx/mount40.jpg
Toyota: https://i.postimg.cc/pT71cQZG/mount41.jpg

All are aligned and owned by different people, which averages out the
driving habits, wouldn't you think?

The only common factor is the road.
o Either the surface (or crown) https://i.postimg.cc/pX44ffQB/mount46.jpg
o The shape of the road https://i.postimg.cc/kGhZh80q/mount44.jpg

The main question here is what effect the road SURFACE has on this wear?