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Michelin 255 45 zr 19 PS4 AS to small?

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Here's those same tires on my aftermarket 19s. What do you mean by "too small?"
 

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Yes the first number is width (265) and the second number is sidewall (45) and third is obviously the wheel diameter size (19). Use the tire size calculator to see what will fit. I wouldn't go more than 29" overall height of tire.

Here is a handy tool. Plug the stock size in and then plug the new tire size in.


Wider is fine like I said, up to probably 275. However if you increase both width and sidewall vs stock numbers, it will likely be too big. I would suggest seeing what tires you can find that are available, then also googling to see if others have put those sizes on their Y. "265/45r19 model Y" etc.