Assertion: tire's sidewall | /r/HasProperty | stiff
Facets:
value: very
type: DEGREE
Source sentences:
text: The second problem is that bias-ply tires have a very stiff sidewall due to the fact that all the plies run from sidewall to sidewall.
text: Bias-ply tires’ stiff sidewalls perform admirably under heavy loads.
text: Run-flat tires obviate the need for a spare tire, because they can be travelled on at a reduced speed in the event of a puncture, using a stiff sidewall to prevent damage to the tire rim.  Vehicles without run-flat tires rely on a spare tire, which may be a compact tire, to replace a damaged tire.