someone selling there used 172s oem which i am very intrested in and almost agreed on the price but just wondering about the tyre sizes and different brands they have told me which is 245/35/19 (i think thats normal) front Continentals and 285/30/19 (should the width not be 275 instead of 285) rear Michelin Pilots, so should i still go for the deal or have them changed the tyre setup ?. thanks in advance