Michelin radials were X, then ZX, then XZX, each generation shared a common pair of traits. Good wear rates and good grip, but sudden break-away on the limit. I bought a set of ZX for my Midget that had been taken off a new Marina, because the owner hated them. I loved them, as they greatly assisted hanging the tail out on the twisties.
Pirelli Cinturatos on the other hand were known as singe-your-a*se-holes as they had more gradual, but irrecoverable break-away at lower limits.
Regulations now require tyre manufacturers to publish a wide range of performance characteristics for their tyres - noise, wear, grip wet, grip dry etc - not 100% reliable, but it does help when buying budget tyres for a workaday car.
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