Sorry mate thought they were 18's. You wont need 92's what you have on there at the moment size wise are what they should be. If you want to check the tyre tread yourself, then jack car up and slowly spin wheel and you should see the tyre move in an S shape (the wheel will look buckled). Tyre shine is OK if used lightly, just make sure the side walls don't look like an oil slick. Best change them both asap mate, as they'll just get worse.
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