Before my trip on 66, I visited various 66 sites looking for hints and advice.
When I mentioned bias-ply, many comments suggested I was crazy unless I was going to stay on smooth payment the whole way. That was not my plans as I wanted to see the old homesteads off the beaten path.
Even with the "smooth ride" radials, I, and the old HJ, suffered severe shake rattle and roll many times. Hubcaps and the horn button kept falling off.