Update: The guy I sold these tires to researched things as I should have done before posting them for sale. (Sorry Rob) He contacted M/T and they said they should NOT be used on a car as they are constructed differently for a motorcycle. Although I do know people that have used them on cars, I don't feel right selling them for use on one...now knowing the difference. I am going to refund him his money and sell them on ebay (as I am not a member of any motorcycle racing forum) as I probably should have done originally. I apologize for any confusion or misinformation I caused.