I find it hard to believe you're the only one
I'll try to remember checking it out as soon as the dealership calls with the good news mine's ready for delivery bext week (hopefully)
On mine too .. and on my Speedmaster 1200. I think (as suggested) it is to do with ABS.. there is a slotted disc that it looks at on the wheel, think it measures wheel speed to activate the ABS when needed (at the very least)