Radial tires have a more flexible sidewall, so the stresses involved
from side stress are absorbed mainly by the sidewall and less by the
rims!
More important is the fact that radials have a smaller slip angle (the
lower the profile, the less the slip angle!). What this means is NOT
that the steering geometry itself changes BUT that the vehicle becomes
more responsive to smaller changes in direction. In other words the
steering gets sharper!!
Dave.
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