Last year I replaced the OEM size tires with 205/60-15 Michelin Pilot XGT H4 for about $90 a piece. From searching here that was the biggest I could put on a 190e and I believe it. The only problem was a little rubbing abainst the front of the front fender when I hit big dips but I rolled it a little.

For ride, I'm getting kind of numb in my old age and couldn't tell much, but it did handle better.