There are some good points made here regarding correct tires. For a long time I have pondered what the correct tire type for my '76 should be. In '76, radial tires we coming into vogue, so it wouldn't surprise me if my car originally had radials. But I have noticed that the speedometer is slightly off at highway speeds, indicating to me that my radials are not correct. But I've been spending so much money on cars and tires lately, the '76 is going to have to live with radials for a while. If anyone can conclusively tell me what S&S put on my car at the factory, I'd love to know.