As Dick Benjamin and others have pointed out to me, be careful not to mix your bias belted tires with your radials as they wear out. This was also written in the owner's manuals of that day, when bias belted tires were more common. They have different handling characteristics and there is a danger in mixing them. Also, how old are these tires? They may appear perfectly fine but old rubber can have tiny cracks in it that you can't see and one day kablooie, there you are with a really severe blow-out. If the tires are over 10 years old I'd replace them all now, if you can afford it. Mark M Robert Dervin wrote: > I will replace the bias ply tires with radials when they wear out. The > previous owner installed them before I purchased the car. They only have > 7000 miles on them with no visible signs of wear. Almost all of the antique > tires are available from Coker tire. >