Unfortunately hit a massive pot hole last night and my front left tyre is now ruined. All 4 tyres are Michelin P-Zero 235/35 ZR19 91y R01. I’ve shopped around but it looks like the local fitters can only get R instead of ZR. Does anybody know the difference? From what I understand, 235/35 is width/diameter, 91Y is the speed rating, R01 is the type of fit (Audi Quattro) and 19 is the wheel size. A few sources say ZR is also a speed rating but I thought that’s what the 91Y was for.