I've posted these before, and I'm not saying you'll need to do this. In fact I really don't think you'll need to do any of this, but these are the modifications I made to clear my much wider 275/35/18's. Which also stick out more than a 1/4" further than the 245/45/17s do
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The fender brace was lengthened 2", and I removed the corner off the lip on the back side of the fender. Neither of these modifications is obvious from the outside unless you already know to look for them. With the 245's just maxing out the stock adjustment on the braces should be enough.
Looks like the front end could come down a little too. Ride height plays a pretty big factor in all this too, it looks like right now that lower corner is at the maximum diameter of the wheel as well. Drop it a 1/2" and you might actually gain a little clearance there.
You can see on my car that the lower corner of the fender is well below the half way mark on the diameter of the wheel
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