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Thread: definitive tire, wheel, and offset thread

  1. #1
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    definitive tire, wheel, and offset thread

    I've noticed that there are numerous threads regarding wheels, offsets, and tire sizes. It would be good to collect all of the info on what we know works, what modifications are required, in one thread with a sticky.

    To start with - my stock wheels, 255/40R18 rubber, 10mm spacers, work with no rubbing when the front fenders are rolled. If the rears were rolled as well, I think 12mm, possibly even 15mm spacers, could work.

    So whatever the stock offset is (anyone? anyone?), we know that we can add (subtract, technically) 10mm to that, with 18x8.5 wheels.

    It would be great to have a chart of sorts, so that we can look up sizes and then choose wheels accordingly.
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    here's what i've had -

    19x8.5 33 offset with 255/35/19 - cleared fine
    20x8.5 34 offset with 265/30/20 - cleared fine with nub on the upright ground down
    19x9.5 45 offset with 265/35/19 - cleared fine with 15mm spacer and nub removed on the upright.
    2003 RS6 - forsale

  3. #3
    Registered User johnnie27's Avatar
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    stock 19x9 ET 35 255/35/19 std fitment no issues no spacers can run any ride height you want
    me 19x9.5 ET 30 255/35/19 no fitment issues car lowered (cannot run a wider tyre w/out rubbing)

    john
    2004 RS6
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    ok, I'm insomniated and have decided to do a little research.

    for starters: rim width vs tire size
    8.5" = 255
    9" = 265
    9.5" = 275
    10" = 285 (has 285s been mounted before??)

    tire sizes within acceptable range:
    255/40R18
    265/40R18 (larger than stock)
    265/35R18 (smaller than stock)
    285/35R18 (smaller than stock)

    255/35R19 (same as stock)
    265/35R19 (larger than stock)
    275/30R19 (smaller than stock)
    285/30R19 (smaller than stock)

    with 8.5" width:
    stock offset = 30mm, 20mm maximum with front fender rolling

    by doing some math...
    9" width = maximum offset 27mm
    9.5" = maximum offset 34mm
    10" = maximum offset 41mm

    Do these numbers look right? I'm no tire expert, but having a chart like this would be immensely useful.

    I don't know at what point filing down the nub on the inside suspension arm is required.
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  5. #5
    Registered User HT MOtorsport's Avatar
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    Here's a useful online calculator for offset too http://www.1010tires.com/WheelOffsetCalculator.asp

    Once my new wheels and tires get here and I see if they fit Ill add the info on those.

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    I am running 19 x 9 et 33 S5 Speedlines in the C6 RS6 style. I applied a 8mm Spacer/Adapter to fit the larger hubcentric bore of the later model Audi wheel, and which also put me at an offset of et 25. The tires are 255/35-19 Michelin Pilot Super Sport. I am very happy with the set up, although I might be tempted to go 265/35/19 when the time comes. The 255/35-19 tires are slightly "stretched" on a 9" wide wheel - but there are quite a few people who go for this look, sometimes to the extremes. 265 would add a little curb protection.
    Daytona/Ebony/Carbon/SEE/RNS-E/19X9 Speedline "Peelers"

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    ok, going through all the numerous wheel/tire threads, I have run into some confusion:

    - the wheel hub for the USDM RS6 is 66.6mm, isn't it? I keep seeing references to a 57.1mm....I am pretty sure that the hubcentric spacers I ordered were 66.6mm
    - the stock wheel: 18x8.5, yes? The ET is 30mm? 33?
    - Euro stock wheel: 19x9? ET?
    Das Silberkugel - Eurocharged Stage 2/MTM/Level 10/Hotchkis/Koni/H&R
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    Registered User repda503's Avatar
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    Stock wheel is 18x8.5 ET 30 5x112 bolt pattern and center bore of 57.1. You need adapters to go to the new 66.6 diameter. Wheels weight 30lbs stock. I have heard people having issues fitting a 265 on a 8.5 width wheel.

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    Registered User repda503's Avatar
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    Question: Do I need to grind the nub on inside suspension if running 19x9.5 ET 30 with 275/30/19 PSS's on them? I notice the calculator says it will be 13mm less clearance.

  10. #10
    Registered User HT MOtorsport's Avatar
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    New shoes fit

    275/35/18 Toyo Proxes R888 (Track tires) mounted on TSW Nurenburgring Flat Gunmetal 18x9.5 ET 40.

    15mm ECS sapcers and 034 3" wheel stud kit.

    They barely fit FYI. If the car was lowered a lot it would rub most likely. I will probably roll the fenders out a little more to give a bit more breathing space.





  11. #11
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    those are very, very sweet! Definitely lower the car - getting the wheels to fully fill out the arches has got to be one of the coolest things one can do to the RS6:
    Das Silberkugel - Eurocharged Stage 2/MTM/Level 10/Hotchkis/Koni/H&R
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  12. #12
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    Quote Originally Posted by johnnie27 View Post
    stock 19x9 ET 35 255/35/19 std fitment no issues no spacers can run any ride height you want
    me 19x9.5 ET 30 255/35/19 no fitment issues car lowered (cannot run a wider tyre w/out rubbing)

    john
    Very interesting... so if 19x9et35 is stock, then I should be ok with 19x8.5@et32 running 255 35 19 with just hubcentric adapters (66 to 57) to run stock 19" A5/S5 wheels. These caught my eye recently:

    A5 Wheels/Tires
    Last edited by Tom Sawyer; June 10th, 2012 at 22:24.

  13. #13
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    I am seriously looking at getting custom made forged one-piece wheels from CCW....about $750 each including custom finish....if I stick to 18" (which I probably will for several reasons, namely the style I want they only make in 18 unless I want 19x10 which I don't), them width/offset is easy

    If I wanted to do 18 but go a little wider than stock (say 18x9), then I would assume tire size 265/40/18 would fit just fine...would stock offset 30 still hold true or do I need different offset? Since they are custom made, I can get anything.....no immediate plans to lower, but that will change if/when DRC craps out

    Thx!

  14. #14
    Registered User kilian tuning's Avatar
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    Mugello Blue C5 RS6 Avant Viper Tuning ECU/TCU
    MTM Bimoto wheels 9,5 x 19 ET 30 LK 5x112 with 275/30/19 tyres
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  15. #15
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    Quote Originally Posted by kilian tuning View Post
    yep, thx.....my concern is really around offset....does offset need to change from stock 30et if I go up to 265 tire width on 18x9?

  16. #16
    Registered User bakes's Avatar
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    Quote Originally Posted by twinsteve View Post
    yep, thx.....my concern is really around offset....does offset need to change from stock 30et if I go up to 265 tire width on 18x9?
    Well, logic says you may want to go to an offset of 25 due to the increased width of your rim. By keeping the offset the same and widening your rim you'd be basically pushing the rim inwards. I'm not sure how much clearance the factory settings allow for on the inside. That being said, my 19*10's are using an offset of 25 with no rubbing so that implies a 9" rim would be fine without changing the offset.
    ECU/TCU chip, Euro Recaro's, KW 3's, Wagners, Venair hoses, Dahlback diverters, Hotchkis sways, Phaeton ducts, lower spoilers, custom vent's in hood

  17. #17
    Registered User ttboost's Avatar
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    I just got new (used) sneakers too...

    Volk VR G2. 19x9.5 ET29 (on all 4 corners) (stock RS4 size)
    Michelin Pilot Click image for larger version. 

Name:	RS6 with Volk VR &#71.jpg 
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ID:	12841Super sport 275-30-19

    No spacers and no rubbing...fit perfect
    and I just lost 10lbs of rotating weight per cornerClick image for larger version. 

Name:	RS6 with Volk VR &#71.jpg 
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    2013 Audi S8

  18. #18
    Registered User repda503's Avatar
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    http://www.audizine.com/classifieds/...?product=80894

    18x10 ET 33. I'm guessing ill need 5mm spacers but what do you guys think? Will they fit?

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