The size tire your car was built with is the correct size. Other sizes "might" fit and "might" work, but nobody has done the engineering and test work to verify that, so nobody is going to go out on a limb and recommend another size. There are things that are involved in engineering a car to a certain sized tire. These include ride and handling, wheel well clearance, speedometer calibration, fuel economy, acceleration performance, etc., etc., etc.
If you want to try some 19 inch wheels with some ultra-low profile racing tires, go for it, but don't be surprised or disappointed when something you didn't consider, like the tire rubbing on the frame, ruins your experiment.
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tyres.
