Radial tires also "roll" sideways in turns a lot more than a bias ply. That's one reason they improve handling- - - - -the tread stays planted more solidly to the pavement, but that sidewall flexing can also result in rubbing on occasion. How about adding a thin spacer between the wheel and the hub, maybe 1/4" of so, to add a bit more clearance?
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!