I WANT TO STRESS THAT I DONT RIDE HARD, DONT ROAD RACE, I JUST RIDE TO AND FROM WORK AND TOUR W/ WIFE AND FRIENDS. I WILL NEVER DO ANYTHING THAT I FEEL UNSAFE TO MY WIFE OR BIKE.
Look at that video again. Do you think he is "riding hard"? Nope. Anything that requires more than a few degrees of lean will put you outside the design spec of a car tire. And riding a motorcycle in any manner other than perfectly straight will require more than a few degrees of lean.
Your contact patch is going to be malformed/distorted.
The patch is going to be unacceptably small at times when it needs to be big.
The patch is unnecessarily large at times it needs to be smaller.
The transition through lean is going to be non-linear and unpredictable.
The side of a car tire is not designed to be driven on.
The tread is not designed to shed water when driven on the edge.
The belts in the tire are not designed to be stressed that way.
It is harder to mount and unmount.
The wheel is not designed to mount a car tire, and it could fail to stay on.
You have probably severely overinflated the car at 46-49psi, designed to run at maybe 32.
It might be ruled gross negligence by an insurance company in an accident.
I can't imagine that would be legal for state inspections.
Even the cheapest, crappiest motorcycle tire will be much safer.
I am not an engineer, and am probably just scratching the surface of the issues.
All this to maybe save $100 over perhaps 5 thousand miles on a $16,000 vehicle?
If I felt unsafe or had any reservations about the change I would pull it off and go back to m/c tires.....
Yeah. I see.