NormC, I think you are asking about the width, I have both bias and radial tires on two different cars/truck and a friend that changed to radials. The radial tires in the 600 X 16 are a GREAT improvement! The tires if you look up on Coker or Lester tires give you the recommended rim width for tires. Look at that information, very limited with the 4 inch rim width.