Radius of brake calipers and dust shield

[Jimminez]

Wondering if anyone has measured the radius of the brakes? I know the diameter of the ceramic rotors is 440 mm and believe the radius of to outer edge of the caliper is approximately 249 mm, but I think the dust shield may bit a bit wider than the caliper itself and was hoping someone has or could confirm.

Wheel manufacturers have have drawings of the calipers and rotors but not the dust shield which I think would be the limiting factor in wheel sizing (my S212 E63 dust shields for example). Living in a climate that requires snow tires, being able to use a 20" wheel is desired by some but even some 21" wheel designs don't clear.

Any help would be appreciated.

[Audi Fanboy]

Hey actually looking to order an RS6 and also wondering if 20 in wheels would fit. Did you ever get an answer?