No, the radials were not introduced in the US market till way later. Why do you need to know of the wheel patern in order to go to radial tires. You can use the original wheels with radial tires. Some hub-cup clicking noises have been reported that are blamed on the radials, but it does not happen to all cars. My Sedan for example does it some times, while my LeBaron does not (personally, I think it has to do withthe condition of the hub cups as well). Anyways, the extra safety and economy you get from the radials is far more important that some potential clicking noises... D^2, 2x68s Quoting Don Savard <res03r3f@xxxxxxxxxxx>: > Hi all, > I know up to and including 66's Imperial bolt pattern was 5 on 5 1/2 > ". What size was the 68 bolt pattern? I'm trying to get radials on my > 68-bias ply tires just don't give me the secure feeling I'm accustomed > to. By the way-were radials standard on the 68 Imperials? > Don > > > >