It's risky and there is already enough risk while riding on m/c tires, why do that except to save a few bit of money? Car tires are hard and flat, not flexible like a bike's tire, and that could well be the difference between losing control in a curve and riding safely through it. Me? I'll opt to spend the extra money and purchase only motorcycle tires. Knowing that the tires are designed for my Tiger is one less thing to worry about while riding.Has anyone in our wonderful community ever tried 'darksiding', this is fitting a car tyre to the rear of a bike. From what I have found out it is a much practiced and perfectly legal thing to do in America, In the UK it's not legal as such but there are loopholes. The main interest for me is economical, car tyres are the fraction of the price of a motorcycle tyre and they also last a lot longer.
I've read many write ups on the pro's and con's of this practice but would be interested to hear from anyone who has actually tried it?