I don't think wear as such *is* present: in those days they used a single
set of tyres for several races IIRC. However I think a bad setup would
cause the tyres to overheat and lose grip.
Unfortunately I don't know much about setups, I'll let someone else
explain the ideal temperatures etc...
I don't think it has a permanent effect on the tyres, AFAIK it's just a
matter of the possibility of losing control when you lock up.
regards
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