Hate to put a damper on these bias-ply tire comments but I just put a set of Firestone 650-16 on my 49 and they are as smooth as can be. Even after sitting overnight the are not flat spotted.
Old bias-ply were made with a lot of nylon, the new ones are not.
My old bias ply tires bumped when cold and had a vibration at about 45 mph. After putting on the new ones I figured there may have been something broken in the old tire casings.
Would I put bias-ply on a stock old vehicle again. Definitely.
