ZR is old school... the following text was clipped from an online source for tyre ratings:
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ZR basically means the tyre is adapted for speeds above 149 mph. ZR tyres includes the speed ratings V(149mph), W(168mph) and Y(186mph).
Before 1990, the manufacturers used "ZR" to mean high performance tyres before the ratings got refined with W, Y…
Nowadays, the marking ZR is not relevant anymore but it is still used in the catalogues of manufacturers and tyre retailers. Look for the speed ratings V,W,Y to find the modern equivalent to ZR tyres and not for the marking ZR. What really matters is the speed rating (V,W or Y).
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These tyres look to be Y-rated which is good for 186mph, and something we'll sadly never see on the speedometers of our mighty A8/S8s ;-)
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2010 B8 S5 Sportback quattro 3.0 Supercharged in Sprint Blue (current girlfriend)
2000 D2 A8L quattro 4.2 in Audi silver (my ex-girlfriend)
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