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You are right about the bumpiness. You are wrong about the added performance.
Tires need some flex.reduce it too much and they will transmit every small bump and hole instead of absorbing it, which will propagate to the roller bearings and the shocks, putting more strain on them. You would also need very good shock absorbers/coilover units with fast rebound and damper settings, which you will never put on a car like that (and if it is lowered then you have already done the worse you could do handling wise, so wheel size wont matter).
One of the reasons i went back from 18" to 17" because is i hated the harshness 18" give. It shaked and break every bones in my back, and i only had 5kg springs front and 4kgs rear.
That and the fact i cant fit 18" legally where i live (but tbh it does not matter seeing how many illegal mods are done on that car :wack: ).
Then there is weight. My 17x8 / 17x9" + tyre combo also weight 8lbs less on each corner with 235 tyres than my 18x7.5" with 215s. This affects acceleration.
All in all ... i would not go back to 18", unless i had a 400+ HP engine in the car, and then i would also get tyres with at least as much sidewall as my 17" have now.
To sums things up: going 18" means it will break your back, put more strain on your suspension, weight more, lower performance and may cost more too (tyre price is costy in 16 and 18", not in 17", at least where i live).
But it may also look cool. Depends on what you intend to do with the car. Do you want it to look like a cool car, or do you actually want a car that works on a track ?
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