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talk with a tyre shop as they have the regulations as to tyre sizes that can be fitted
While you can put wide tyres on the vehicle you are limited by law as to the diameter of the tyre that can be fitted as the vehicle has been certified to run a certain diameter tyre and if you breach that certificate then the vehicle will be un-roadworthy, have an incorrect speedo reading and will negate any insurance in an accident
Each tire has its own rating and performance. The tire size does not determine the tire's pressure ratings. There is small lettering on the tire that will tell you its max pressure rating. If you can not find it because the tire may be too old or just too dirty to read then Look up the brand of tire such as Michelin, Uniroyal, Goodyear, and Google the tires specs. the manufacture ratings will be easy to look up.
The wheels could have been changed on the car from the standard original factory set and hence the tyre size may not be the standard factory original size. The size of the tyres on the vehicle now is moulded into the side wall of the tyres and is easy to read. Check all 4 tyres because larger size tyres may have been fitted as a pair to the rear.
The size might read - for example 245 45 18 or 235 45 17 (there are a huge number of sizes for each model of tyre).
The first 3 numbers are the width of the tyres in mm eg 225 mmm or 235 mm and so on. The second 2 numbers are the tyre profile size or ratio (which can be 70 65 60 55 50 45 40 and so on. The third number is the wheel diameter size. If you have 18 inch wheels on the car the tyres will read 18 or if they are 17 inch wheels the tyres will read 17 and so on.