[Kostamojen]

Ride comfort would improve, odometer would be off, acceleration might slow, and they might not fit in the wheel well without rubbing.

The better idea would be to down-size to 16" wheels to run taller tires if you are concerned about road comfort.

The main reason most people go to a "taller" tire is to run a off-road tire that gives more ground clearance... This isn't the case here.

 

[Kostamojen]

Sometimes it ends up rubbing at odd spots during hard cornering if you up the size. I've had A LOT of experience with fitting larger tires into small wheel wells... Its a bit of an art to get it right