Morning mate
I'm not a guru, but I am fussy about the wheels
Looks like they should be fine.
The attached picture is of my current set 275/35/20 ET29 9J
I went with ET29 in order to avoid spacers because I truly hate OEM offset and wheels being so deep inside the arches. It worked.
There is 6mm gap between the face of the ceramic caliper and the back of the spokes.
10J will stick further 7mm so if you are not planning to significantly lower the car you should be ok, just about. If you do lower you may get the rears rub against the inner wheel arch, just bare that in mind.
If you want I can attache later few pics of my 9J ET29 and how far they poke.
Can I ask why 10J and not 9J ??
Are you aware that 275 tyre will look stretched on 10J?? Not massively, but it will, and on my previous D3 with slightly lowered front this has caused inner tyre wear - brand new tyre within a year had 5,5mm left on the outside and absolutely nothing on the inside with wires nearly sticking out.
Also, because of the larger contact area you may notice a bit more effort required when turning the wheels, not sure if that would put an extra stress on the power steering pump, I'm not that technical unfortunately.
275/35/30 on 9J is a sweet setup looking very OEM, nothing silly, and ET29/25 is as far as I would go, at least with ceramics on - I don't know the width difference between standard S8 caliper and ceramic one.
In the pic attached existing is the 9J and new 10J
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2006 D3 S8 5.2 V10
Ceramic Brakes, Bang&Olufsen, DTV, DAB, Rear Camera, BT, TPMS, Soft Close, Auto Boot, AMI , 4 Zone AC, Home Link, All Electric Blinds, Fingerprint, Ski Hatch, Black Extended Leather, Heated Sport Seats, Alacantra, Carbon Trim inc Aluminium Pack 2.
2015 A3 S line 1.4 TFSI - for the missus to keep her away from my car.
Standard S-line equipment, no extras.
2006 D3 A8 3.7 V8 - SOLD but not forgotten