I hope this will help. On my '62's I have 255/70-15's. The specs are: 8.3" tread, 10.5" cross section and 29.1" high. They are mounted on 7" standard back-spaced wheels. They are within 1/4" of the springs on the inside and about the same both on the inside and outside of the wheel house. I guess you could conclude that anything less than 10.5" of cross section width would fit. Again, I hope this helps.