A8 / S8 (D2 Platform) Discussion Discussion forum for the D2 Audi A8 and S8 produced from 1994-2002

need offset/width wheel help

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Old Apr 17, 2006 | 10:55 AM
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Default need offset/width wheel help

I have finally picked out a wheel to run, and i can order them in a custom offset, bolt pattern and a custom width.

I want to do 19s, so that i can tuck them hard while driving if i want to, and try keep that a8 ride a little bit... i have heard that 20s will be very harsh, and i expect i cant run them as wide.

i want to run a 19x9 in the front and a 19x10 in the rear, and i dont know what offsets to run to get the most dish i can out of them, does anyone know the OEM offset? or some offsets of some very deep dish well fitting wheels?
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Old Apr 17, 2006 | 11:11 AM
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What size tires are you planning, tread width is important to clearances.
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Old Apr 17, 2006 | 12:39 PM
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i was thinking either a 225/40/19 or a 225/35/19 stretched.
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Old Apr 17, 2006 | 08:47 PM
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Default 225/35-19 is not a good idea.

- The diameter is much too small, 1.1" smaller than the OE tire. In addition to the 6% speedometer error, you'll have a very large wheel-fender gap.

- The <a href="http://www.tirerack.com/a.jsp?a=AR4&url=%2Ftires%2Ftiretech%2Ftechpage.jsp %3Ftechid%3D35">Load Index</a> is too low for the heavy A8. A 96 or higher index range is standard, the load index of the 225/35-19 is 84 or 88.

- The tire is designed for a 7.5-9" wheel width. A 10" wheel width will probably damage the tire.

225/40-18 isn't much better. What you want to use is either a 245/40-19 or 255/40-19. The diameter of the former is identical to OE, the latter is 1% larger.<ul><li><a href="http://www.audipages.com/upgrades/tiresizeoptions.html">A8/S8 tire options</a></li></ul>
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Old Apr 17, 2006 | 09:42 PM
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Default Good Advice, those tires are way too small. I went with P25540ZR19

I would personally go with 19x9 with a 38mm offset all the way around.
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Old Apr 17, 2006 | 09:48 PM
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Default Thanks man

<center><img src="http://www.fourtitude.com/gallery/albums//Events/Worthersee/2005/Audi%20Brand%20Group/129.jpg"></center><p>
Wheel fender/tire gap isn't a problem on my car. and i really want to be able to pull off as much dish as is possible.

a 19x9 would work nicely, although i have seen a 20x11 that has been pulled off, and it would be awesome to have that much more dish and attitude of a look. the car that i have pictured above is a 20x11

i really dont know much about tires, so the 225 was a major guess, so i really appreciate it!!! i will look into the 245/40/19 or somthing maybe a little smaller, i dont mind stretching, and i dont think it will affect it too much, i have seen it done tons of times in Europe.

TSHong, do you have any closeups of your wheel/fender lined up (see far in they are, i want mine to be flush)
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Old Apr 17, 2006 | 09:55 PM
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<center><img src="http://www.mkippen.com/images/forvortex/audi.jpg"></center><p>285/30/20 stretched on this sucker... this is how i want my tires too look, not too stretched, but just a little bit. i honestly dont know what tire to run.
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Old Apr 17, 2006 | 10:47 PM
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Default would this work?

a 255/35/19 front with a 19x9
and a 265/30/19 rear with a 19x10

how do you calculate the diameter??
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Old Apr 19, 2006 | 03:28 AM
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Default Tire Diameter = Wheel Diameter + 2 x (section width x profile / 25.4)

For the 265/30-19,

Diameter = 19 + 2 x (265 x 0.30 / 25.4) = 25.3

Since that's 3% smaller than the 26.0" diameter of the 255/35-19, I wouldn't recommend it. A 3% difference is the maximum that could be tolerated by the Torsen center differential. The 265/40-19 would be much better.

Use that link in my original reply, it contains about every conceivable tire size that can be used on the A8/S8, and the link shows the tire diameter.
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Old Apr 19, 2006 | 03:32 AM
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Default Here's my 255/35-20 on a 9" ET39 wheel

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