Tire wear

[Desmo Demon]

The difference you are seeing is because we drive on the right hand side of the road in this country.   Meaning your visibility through left hand corners is much greater allowing you to push harder and take them faster, scrubbing off more rubber on the left side of your tires.  If we drove on the left hand side of the road you would see the same accelerated wear on the right side of tires.

I live in South Carolina (right side of the road) and my wear pattern is the opposite. Me, my wife, and at least two of our ridding buddies wear the front tire to the right of center faster than the other sections of the tire. My only guess is that we are loading the right side of the tire on right-handers more because of the tighter radii of the curves. You'd think being leaned over longer on lefts would make up for the difference.    And this isn't a single tire occurance. We've worn out every front tire faster on the right side than the left side for at least 30 tires between us.

[RUFKM]

Drive around the island clockwise more often - works for me.

[Scissors]

Usually the 'crown' of the road will bias the wear a bit to the left.

Also, most riders are more comfortable in left turns, and tend to push a bit harder.

You're on to the truth with the second bit, but the first part is a myth.  There was a web site where they actually investigated this and found that the angle of a road's crown wasn't anywhere near the angle of the left side wear.  Not to mention, I ride both directions on the same HOV lanes, meaning that if it's the crown, I should have equal wear on both sides, but I don't.

The most likely culprit, which matches the steeper angle of the typical left side wear?  Left turns at lights.  The left turn taken at a light is significantly longer and is taken significantly faster than right turns typically are.