Wheel fitment of R8 rims on an S5

[perfectneg]

Hi guys, I just picked up a 2014 S5, so still kind of new to this model and have tried looking for the answer to my question but cannot find one, however apologies in advance if this has been asked before;

I have found a pretty good deal on some HRE forged rims (P40S), however they are off a first gen audi R8. The fronts are a 8.5jx19 with ET34 and the rears are 11jx19 with ET40.

Few questions;

1.) Is it ok to run staggered rims and tires on an Audi S5, without damaging the AWD system, sports diff, etc?

2.) Would this width/offset fit onto an Audi S5? Is there some kind of guide anywhere that can show this?

3.) What is the largest tire size you can fit on a stock height Audi S5 in the front and in the back?

4.) I believe the center bore on an Audi R8 is smaller than an S5, would I have to bore out the rims?

Many thanks for the help! Please let me know if you need any further details.

-Alex

[CyberPMG]

From past experience with my older Audi (B6 A4) it would be ok if there was an inch or less in the difference in width between the front and rear wheels without damaging the quattro AWD system. I would look into a square set of wheels and then use different spacers to get both the front and rear looking flush.

R8 wheels use a 57.1mm center bore. B8 & B8.5 S5 uses a 66.5mm center bore. Might not be a good idea to bore it out as it may weaken the center structure of the wheel.

Don't have much more info as I'm still rather new to the S5 myself.

[Neil F]

Width is not an issue with AWD. Diameter/circumference of the actual tire changes the wheel speed. With a 8.5 and 11 you are going to be using different tread width tires so the aspect ratios will be different in order to have approximately the same sidewall height.