One known issue is your car wont look as good. On more serious note as long as you get a matching diameter as your 17's everything will be fine. You may also lose a small amount of directness to your steering due to added tyre wall flex. What model 9-5 is it, i.e what supension is it running?
It is likely you will notice a difference in terms of ride comfort with the taller sidewall. I ran 16" wheels on my Arc, then switched to 17's. The 45 series tire with a stiffer sidewall mounted to the 17" wheels definitely transmits more small road imperfections, and expansion joints, potholes, etc are felt more sharply.
You will also likely lose some steering response due to the taller 55 series sidewall.
This, and any decrease in road noise, will likely vary greatly depending on the specific tire you choose.
you can always upgrade to better tires for ride better comfort, performance, and road noise. You'll have to spend more money on good tires but it is worth it.
correct, only 4 points that transmit the power in the car to the road
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