AUDI A8 (D3) 19" to 20" Wheels (RIDE QUALITY)
05-04-2016, 03:20 PM
#41
Starting with A5 and basically every Audi after that, they went from a center diameter hole of around 57mm to a newer one of approx 66mm. About the only ones still on the smaller size as of recently were the Q3 and the R8, as well as lots of VWs. Thus you need an adapter ring that fills in the hole of the bigger center S5 wheels so it is hub centric to the smaller D3 hub center. Otherwise all the weight is on the lug nuts only and the wheel can move some around the hub in theory. In practice makes it more likely to have vibration and similar issues. Just get a set of the hub centric rings. People seems to say the metal ones are more durable than the plastic, but neither are perfect. I have never done it so don't know preferred sources, but some others on the board have.
05-04-2016, 09:37 PM
#42
AudiWorld Super User
66 to 57 1 Aluminum Hub Centric Wheel Centering Rings OD 66 ID 57 10 | eBay
Also, A5 wheels have a different offset less positive that our D3s. They will work but will stick out more so it's matter of person taste on fitment. If you can test fit the wheels to see if it might be too aggressive for you.
Last edited by TSHong; 05-04-2016 at 09:41 PM.
05-07-2016, 01:25 PM
#44
AudiWorld Super User
05-07-2016, 01:39 PM
#45
05-07-2016, 06:38 PM
#46
AudiWorld Super User
+35 are a perfect fitment for our cars. My RS4 replicas on my 05 were 20x9 +35mm and the fit was spot on for my taste. Are those aftermarket or OE wheels?
05-07-2016, 06:46 PM
#47
Looked up and it said that 255/40/19 would be same circumference.
I hope that is what you were talking about.
The wheel are from S5, guy had an A6 but his car was lowered and the fit was tight
Last edited by Cboogie; 05-07-2016 at 06:48 PM.
05-08-2016, 12:22 PM
#48
AudiWorld Super User
255/35x19 has 26mm smaller diameter (82mm smaller circumference) than 255/40x19.
05-08-2016, 09:49 PM
#49
AudiWorld Super User
Mishar is correct, as usual. The 255/35 is 1.1 inch shorter than the 255/40. The 35 vs 40 is a ratio of the sidewall height, relative to width. So I would change then as soon as possible.
05-09-2016, 01:13 PM
#50
Yeah I plan on getting the new tires soon.
First pic is the Stock A8 tires compared to the Stock S5 with old tires I just bought.
I knew the mph would be off a bit, but I would only be driving around town. When I go on vacation later this summer I will take them off and put the stock back on.
Second pic is Stock A8 and New tires that I will buy for exact circumference
First pic is the Stock A8 tires compared to the Stock S5 with old tires I just bought.
I knew the mph would be off a bit, but I would only be driving around town. When I go on vacation later this summer I will take them off and put the stock back on.
Second pic is Stock A8 and New tires that I will buy for exact circumference
Last edited by Cboogie; 05-09-2016 at 01:17 PM.