[AndreasPassat]

I need to put new shoes on the W8 and would like to upgrade the wheels while I'm at it.
Found a mint set of Audi A6 2009-2011 (10 spoke) 18x8 - (48mm offset - I think) - can someone confirm?
Will be wanting to put on P235/40 R18 tires.
Does anybody know if this combination will fit on my W8?

 

[Gazwould]

Upgrade in looks , down grade in dynamics .

 

[AndreasPassat]

down grade in dynamics .

Huh? Why is that?

 

[VAGguy]

Perceived dynamics aside, they'll fit. Madras have a 45mm ET. They should still be 57.1mm on those. 66.5mm started in 2012, I believe.

 

[Gazwould]

Huh? Why is that?

How Does Wheel Size Affect Performance?

One of the first and easiest modifications to a car can be to slap some larger wheels on, but what what affect does it have on acceleration and overall performance?

www.carthrottle.com

Unsprung Mass - What's this mean to you? - Drive Auto Sports

Unsprung mass is the total weight of every component unsupported by the vehicle’s suspension: wheels, tires, springs, shocks, linkages, brakes, and even lug nuts! A simplified equation for determining the amount of unsprung mass is the weight times the force applied. For example, the total...

www.driveautosports.com

Are bigger wheels really ruining ride quality? | Autocar

We pit a sporty supermini against a big-rimmed, and theoretically more comfortable, SUV to find out

www.autocar.co.uk

 

[AndreasPassat]

I'm well aware of all the dynamics involved.
Just switching between brands of the same OEM spec tire can change in diameter by up to .400"
Tire wear alone over the life of an average tire is up to .600" on diameter.
The tire(s) I would like to use are .200" larger than the original factory tire.

The original W8 Madra wheel weighs 25lbs.
According to the spec sheets I've found the Audi wheel weighs approx 1 pound more.
Yes the tire(s) will weigh a couple pounds more then the originals.
Then if I'm so concerned about un-sprung mass I can always toss the original W8 calipers to the curb and throw on my set of 17z Porsche calipers.

The difference (in my case) between what is/was original and what I'm wanting to do is so negligible I won't even notice the change.

All this coupled with a set of PSS9 coil-overs I certainly won't be loosing anything on the performance side.