Hi Dave,
Yeah, I have seen the screws on the rims, and I knew it was for wheel slip. That is also the reason some racers paint a white stripe across the rim and tire sidewall to see if it has slipped. I was only curious about th tubes in a regular bias ply application. Maybe no advantage. I just know when a bias ply blows out it BLOWS out dramatically. You are right about the balance issue. Not to mention further weight being added to the wheel, and therefore unsprung weight that requires power to move. But I don't think performance is foremost in the minds of FWLKers (not that these cars do not perform). Maybe just as a safety feature. I know some police cars use tubes in the tires as some sort of high speed protection, but I am not sure if that is the reason for the use or not. Obviously, police cars are on radial tires today.
Misc fact- Radials did not become standard equipment on new cars until 1978! Not sure who introduced them, but they were available starting in the late 60's. I remember the 'radial tuned' P******C's.
Oh well,
Happy Motoring!
Charles.
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