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The idea is that because of the sidewall construction of a radial, they can break the bead even when properly inflated. Bias ply's don't seem to have this problem. Maybe it is because you cant corner a biasply as hard as you can a radial.
Radials are designed to flex side-to-side on cornering, which puts a high -local- load on the wheel from the tire being pushed sideways.
A bias ply tire is designed to be very stiff so that the load is -distributed- across almost the entire circumference of the tire during the same load.
This same difference is also what makes radials much more comfortable to drive on, as they flex under normal driving as well.
The localized loads on a radial need an extra bead lock on the rim to resist this load and prevent the tire from popping off the rim.
Jeff - '64 F100 Ford truck with stock, really tall and skinny, funny looking bias-ply tires, and a '67 Sqbk
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