My honest curiosity (and my main concern) is of what one cannot see; once the car tire is mounted onto the motorcycle wheel. Does the lower foot of the tire bead; seat firmly between the wheel's bead hump and the side of the wheel's bead flange... with no gap?
No gap here:
Do the current car tires that some of you are running; present a snug fit between the wheel's bead hump and the side of the wheel's bead flange?