You aliens are getting harder and harder to distinguish from AI.
Time to up your skills if this sort of response makes you think AI is involved. This is not rocket surgery here.
So, are you in the 'Great' or in the 'Outstanding' camp?
I choose 'outstanding', but in the sense of it being an outlier idea rather than one of greatness. It's like suggesting making tires out of hardwood.
BTW, re. plastics for this application: Shore A is applicable.
PU Shore A is in the range of 10 to 60 typically. Tires start at 55 and go up from there. Typical pneumatic road tires are in the range of 65 to 70. PU would make for a very soft tire.
Does it matter though? Europeans don't drive anyway.
making tires out of hardwood Change my front left tire, please. Got a flat? No, got termites.
Shore A and D range is 0 to 100. Useful range is right in the middle somewhere, since that's where the best theoretical precision is. Those meters use a three seconds dwell time before sampling because the tip must have opprtunity to penetrate (wink) the sample. After all, it's a measurement of displacement of a flexible sample using a specific tip shape, force and time. Ba-Dum-Tiss.