Going from 18 to 17 in wheels.

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Originally Posted by biglimited

Maybe wrong thread but still wondering why Porsche puts 18" originals wheels 7,5" and 9" 225 and 265 tires? I am thinking changing to 215/40 and 255/35 tires. Any downsides to this? I think possibly a bit more light feel to driving..? Car is 2004 S and with optional sport chassis

255/35 tires are unobtanium so probably not the best plan. 225/45/17 and 255/40/17 are very common sizes available with lots of tire choices everywhere.