245/45/19 in theory at least would be exactly the same diameter as 275/40/19 which KFizz has fitted.
Here's his post from the
Avants Only > Official B8.5 allroad Wheel Thread
Compared to his wheels specs (19x9.5 ET33) the 245/45 on those factory rims should have 8mm less poke and a healthy 22mm more clearance than those to the inside wheelwells.
Should fit fine IMHO

Originally Posted by
KFizz
Alright, so I finally installed the big tires. 275/40 R19, Pirelli P-Zero. Definately a thicker tire, I'm sure the look is not for everyone.
It was a little tricky getting the wheels on. Unknown to me, the rear hub assembly shifts forward on the vehicle when the suspension is decompressed. So the tire was contacting the front of the wheel well when I put the wheel on. It's fine once the car is on the ground. So anyway, they fit.
Vehicle ride is much better (coming from 255/35/19 PSS). It just feels nicer to drive now. I expected it to tramline more, but it's actually better so far. Vehicle has a bit more height now, which I'm fine with.
Sorry for the garage photos, I just grabbed something quick.
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