No longer at stock ride height, but I did switch with those exact specs. If you're talking
strictly about looks, the taller sidewall of the 245/40 tire can make the 19s look even smaller, since you're (probably) aiming for the stock 20 overall diameter. The gap arguably looks worse, since it's now filled with less wheel (depending on tastes). Personally, I like the appearance of 20s, but I made other considerations which resulted in 19s.
There's enough tire, suspension travel, spring and damping for rough roads, though you'll damage a wheel and tire with any setup, if you're unlucky. Try to balance as best as you can and live a little.
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