[Vegas Street Rider]

Alantf is correct regarding the design differences between motorcycle and car tires. The handling will be greatly affected and you could lose traction in the turns. Also, the side walls of a car tire are not designed to be run on and you could have a failure. Obviously, if you are only running on the streets to and from work, etc. versus running twisty roads, your risk may be low. But why risk it at all for a "cool" look. Just my two cents worth.