Tire life
I have been running Dunlops on a '86 FLHTC, the present D402 rear has 8,800 miles and is near replacement time. The previous rear D402 ran 9,900 miles. Replaced rear D402 tire before that early at 6,400 miles due to a gouge cutting some of the sidewall rubber off from a wreck. Rear D402 tire before that went 11,640 miles. Rear D402 tire before that went 8,840 miles (replaced early in preparation for long trip). Rear D402 tire before that ran 15,040 miles and was pretty bare. Tire before that was a D491 and ran 14,400 miles and was pretty bare too.
Had more tread left to go to the wear bars on the recent tires, but replaced them when one portion on the cirumference was wearing a bit thinner than the rest. The air pressure was 38 psi to 41 psi, and 44 psi in the rear when loaded heavier.
The fronts were replaced at 22,400 mile average.
Traction seemed OK while traveling in rain, a few snowstorms, and 108 degree days.