Question about Radial vs Bias tire on TR3 and TR4

["Musson, Carl" <musson@chekhov.arts.usf.edu>]

At what point were Radial Tires offered as options and then as standard on
the TR's.  My guestimate would be optional beginning with about the 58 model
year but standard - I don't know.  TR4's?

Thanks
Carl

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