BLE: what kind of eye-opener?
The sharper the curve, the higher the speed, the more the tires wear.
The “eye opener” was how fast high cruising speeds makes motorcycle tires wear. Straight line, as in doing 80 in the left lane of the freeway verses keeping it down to 55 or 60 on the back roads, even with their curves.
I still corner fairly aggressively on my bike, it seems to make the edge wear keep up with the center wear and the rear tire doesn’t get that “flat spot” in the center of the tread.
Motorcycles used for long distance touring are notorious for flat spotting the center of the tread on the rear tire. It tends to make for heavy steering, although, you don’t really notice it until you put a new rear tire on, now suddenly you have an unworn tire and the handling difference is like night and day.
Think about it, if it takes about 35 horsepower at the rear wheel to make a small motorcycle go 100 mph, how much linear force is the engine fighting from air resistance.
We go to the linear (drawbar) horsepower formula.
HP = pounds of force X feet per second / 550
100 mph = 146.7 feet per second.
Solving for pounds of force we get 131 pounds of force. In other words if you were towing the bike at that speed with a water ski rope hitched to a pickup truck, the rope would have a tension of 131 pounds. This is the tractive effort the rear tire must apply to the motorcycle continuously.
This causes something very similar to slip angle, it’s a slip speed. The bike is actually going a fraction of a percent slower than the theoretical speed due to tire rpm.
Now if you cut that speed in half, the air resistance is only a quarter as much and the tire is under much less stress.