I’m running the 10spoke 20"x9" wheel, they were a Euro wheel in the same 26mm offset. I am also running a set of the 19" 10spokes on my S5. Running the 275/30-20 PS4’s on the RS5 and the 265mm tires on the S5. I’ll probbaly upgrade to a better looking (probably BBS, and a pound or two lighter) someday. I have the original Rotors at home, really need to get rid of them. Even though they do look good they are just so damn heavy. As GERMANBrew can probably attest, going to a set of Lightweight wheels definitely makes the car feel better. Way more noticeable than Carbon Rotors as the wheel radius distance from the center is double compared to the Brake Rotors, but it all helps for sure.
would those be the “5 V” rims? according to this 14.1 kg from overview here. The heavy rims can take a beating and if you, like me mostly, roll at relatively even speed, long distances can (at least I think) make the steering more fitting a GT car in the sense you feel the road less and it is less responsive.
Rotational inertia is the square of the radius calculated as the location of the average mass out from the hub times the mass. I believe the wheel is kept rolling/being pushed forward by its mass as it translates to linear inertia or momentum knows as the centrifugal force. If the mass is further out on the wheel this inertia is greater. In how rotational inertia is defined the radius is, four times as important as the mass alone: m(2r)^2/mr^2 = 4 the average mass of the brake rotors is a bit farther towards the hub as well than halfway that of the rims. m(2r)^2/m(0.75r)^2 ≈ 4/0.5 = 8. would make it 8 times as important as the rotors if mass savings are the same
They are not the V-spoke design, they look just like the 19" 10 spoke but are in 20x9". I wish I could grab the part # off of them but I’m currently living in Hawaii with my S5 & wifes Q5 and the rest of my cars are in my shop back in Washington state. I bought a piece of property here and plan to build a shop before the house 
then I can move most of my shop here minus what I plan to sell, do need to downsize. Anyone want a set of Rotor wheels?
That looks like the ones on the S5 right now but the part # on mine is 8T0 601 025 CR, may just be a different color, can’t quite tell from your pic but they look the same.
Yes, the one ending with CR is the same as the one ending with BH. CR I believe newer.
Fits in here mostly as something to be avoided for weight but I am shopping for Winter tyres and wanted to ask what are your views are on XL tyres for the RS5. I mean at braking there is a lot of force on the front tyres and I had one tyre puncture side wall joint along it about a fifth of the circumference was cut open (tyre the Made in Germany Dunlops that came with it from factory). Positive it happened a hard braking. With lighter weight rims unlike the rotors, I have on, XL should definitely not be necessary? Obviously I am buying higher quality tyres and the preference is an SL tyres.
I’d say you should stick with XL tires. Wheel weight doesn’t really make a difference on sidewall bending at braking. Also, non XL tires might have a bit more sidewall play on corners. With that, you put some more strain on the Torsen, and that’s never good.
I am trying to sell my rotors. I wonder where would be the best place to get them sold. They should fit an S5 a bit easier than an A6 but with no wider than 265 tires. A6 needing 255 ideally as I understand. I am considering waiting until my tires are worn out having 275s. An A7 they should fit. The A5 I am not sure. Maybe Facebook groups for the respective model lines…