19" Downside
My 2011 370Z came with 19" tires. The ride is harsher than you will experience with 18" wheels. This is because the sidewalls of the larger tires are thinner, hence have less flex.
It's all just for flash; there is no performance or handling benefit to be had from larger wheels. In fact, handling can be degraded. So if you really really like the look do it. Just be aware of the downsides.
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