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Not sure if my 63 is the same but I have Hoosier QTP 29 x 11.5 tires in my stock wheelwell's on my 63 and it's the biggest I can fit in there. My springs are not moved and I have about 1/2" on the inside and outside of the tires. The tread is actually only about 10.5 as the 11.5 stands for the tire width. I could actually fit a 30" tall I believe as I have room to go taller but not wider. Ron





Looks good Ron,It should be the same if not close. With Bias ply tires its hard to figure out what is what in the numbers from radials.
I think I'll go with the Coker 850-15 as it is the same size as you have. but they are 30" tall