1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Another Alloy wheel question... sorry

klauster Apr 19, 2013

  1. klauster

    klauster Well-Known Member

    1,188
    112
    63
    Can I just check. For those with standard and uprated alloy wheel option on the RS3...

    What size are your alloys?

    Are standard alloys on the RS3 19'' 8.0J all round?

    Are the upgraded alloys 8.5J all round or just the front?

    Looking to change my alloys and need to check before I make a mistake :)

    The alloys I am looking at are 8.5J 19''s, I don't want rubbing :)

    Help appreciated...
     
  2. 45bvtc

    45bvtc Well-Known Member Supporter Team Daytona Gold Supporter Team Cornflower Blue

    3,211
    3,727
    113
    Standard fit is 19'' 8.0J FRONT and REAR: Audi Part No: 8P0601025CP @ 19-inch x 8J ET50 Tyres, as you know, are: 235/35 front's and 225/35 rear's

    Optional is an 8.5J FRONT with a 255/30, while the rear remains as an 8.0J with a 225/35

    Note: I run 235/35 winter tyres on both the front and rear on the standard 8.0J rims, and I do, occasionally, hear the rear tyres 'kiss' the inner wheel arch/trims - no sign of damage, however.
     
  3. klauster

    klauster Well-Known Member

    1,188
    112
    63
    many thanks for that... next question is then...

    Could you run 8.5J on the rear with 235 tyres and not have an issue?
     
  4. 45bvtc

    45bvtc Well-Known Member Supporter Team Daytona Gold Supporter Team Cornflower Blue

    3,211
    3,727
    113
    A 225/35 on an 8.0J rim is 239mm (max in service) width, however, on an 8.5J rim this width goes up to 244mm.

    So, for a 235/35 on an 8.5J rim you're going to be increasing the (max in service) width by 10mm to 254mm (and that’s 15mm above existing).

    So, if the ET of the 8.5J wheel remains the same as the 8J wheel you'll be loosing at least 7.5mm clearance from existing; good luck Nick, let me know how you get on…
     
  5. klauster

    klauster Well-Known Member

    1,188
    112
    63
    offset of the new ones is ET45... if that helps any....
     
  6. P_G

    P_G Active Member

    379
    86
    28
    http://www.audi.co.uk/content/dam/audi/production/PDF/PriceAndSpecGuides/rs3-sportback.pdf

    On page 24 Option Code F74 8.5Jx19 wheels with 255/30 front and 225/35 rear tyres. I gather they are ET50 but it doesn't say but would make sense if the 8J's were also ET50. Funny though because on the drivers door the tyre pressure list includes front and rear pressures for 235/35 tyres. I have 235/35 fronts and rear and have to say even with family in there is no rubbing on the rears against the arches. My winter 18's are also 235/40's but they are ET45 8JX18 and again no rubbing.

    I'm guessing it will be tight and you'll have to stretch the tyres on them so they don't rub in the arches. Sportec run 9x20 rims on their project RS3 which are ET50 so you would think an 8.5Jx19 ET45 would work.
     
    Last edited: Apr 19, 2013
    45bvtc likes this.
  7. klauster

    klauster Well-Known Member

    1,188
    112
    63
    on ballz, I hate being cutting age and one of the first to jump in :) thanks for the info
     
    45bvtc likes this.
  8. P_G

    P_G Active Member

    379
    86
    28
    Get them on with 235 tyres so I can see if my dream of Sportec Mono 10's can be a reality!
     
    45bvtc likes this.
  9. 45bvtc

    45bvtc Well-Known Member Supporter Team Daytona Gold Supporter Team Cornflower Blue

    3,211
    3,727
    113
    Maybe this will assist:[IMG][​IMG][/IMG]
     
    robbiemac likes this.
  10. P_G

    P_G Active Member

    379
    86
    28
    If I am working this out right;

    8J = 203.2mm Centre 101.6
    8.5 J = 215.9mm Centre 107.95
    12.7mm difference

    ET50 on 8J means 50mm from centre so mounting plate is 51.6mm from outer edge
    ET45 on 8.5J means 45mm from centre so mounting plate is 62.95mm from outer edge
    11.35mm wider on the outer

    In effect like running 10mm spacers on each hub at the back. The difference between 225 ans 235 is 100mm, 5 mm on each side of the wheel so with 235 tyres on they would be 6.35mm futher out than 8JX19 ET50's on 235's. I think it could just work on the rears, plenty of pace on the fronts.

    The only other things is whether the centre bore is 57.1mm or 66.1mm. If the former OK, if the latter spiggots needed as well.
     
    Last edited: Apr 19, 2013
    45bvtc likes this.
  11. 45bvtc

    45bvtc Well-Known Member Supporter Team Daytona Gold Supporter Team Cornflower Blue

    3,211
    3,727
    113
    I agree P_G, but don't forget to consider the everso slight arc from static to full droop to full compression, not just the static position. My 235's on the rear are ok in static and droop, but 'kiss' on compression. I really do think Klauster should try it first... :footy:
     
  12. P_G

    P_G Active Member

    379
    86
    28
    Maybe the solution is 8.5J's with 225's on the rear then.
     
  13. klauster

    klauster Well-Known Member

    1,188
    112
    63
    will 225s fit ok on 8.5J? just look slightly more stretched?
     
  14. klauster

    klauster Well-Known Member

    1,188
    112
    63
    If these have preiously been fitted to a MkV Golf R32, can we assume that the bore is correct?
     
  15. klauster

    klauster Well-Known Member

    1,188
    112
    63
    a deposit has now been paid by the way :jester:
     
  16. 45bvtc

    45bvtc Well-Known Member Supporter Team Daytona Gold Supporter Team Cornflower Blue

    3,211
    3,727
    113
    225's are a recommended fit for 7.5 to 9.0J wheels - but they'll expose a whole lot of wheel rim :ermm:
     
  17. klauster

    klauster Well-Known Member

    1,188
    112
    63
    looking at this:

    Tyrestretch.com

    I'm not entirely sure 225s look right
     
  18. 45bvtc

    45bvtc Well-Known Member Supporter Team Daytona Gold Supporter Team Cornflower Blue

    3,211
    3,727
    113
    Just double checked (while clearing out last Sunday's sheep droppings from the rear wheel arches): 235/35's on 8.0J rims fitted to the rear of my car have 'kissed' the inner dirt shields so; my best guess is that 8.5J rims with 235/35's will fit, but you may have to do a little manipulation of your inner dirt shields to maximise clearance - there is loads of space behind the dirt shields…
     
  19. JonnyG

    JonnyG Active Member

    227
    67
    28
    Just to add that the "optional" Audi front wheels have an ET53 offset - so they are 19 x 8.5J ET53 (with 255/30 tyres)
     
    45bvtc likes this.
  20. RYes3

    RYes3 Active Member Team Nardo Audi RS3

    919
    198
    43
    I have the upgrade, 8.0 rear 8.5 front :) et50 and et53 respectively.

    I have pictures of the stampings somewhere if you want to see them :)
     
    45bvtc and Kelza like this.
  21. JonnyG

    JonnyG Active Member

    227
    67
    28
    Have you driven the car with standard wheels too ? just wondering what difference you can feel ?
     
  22. RYes3

    RYes3 Active Member Team Nardo Audi RS3

    919
    198
    43
    No I haven't actually, I did drive one on a test drive without them but I didn't get it going enough :)

    I have never noticed any under steer even in the wet, in fact it is the rear that starts to skip first.
     
    45bvtc likes this.
  23. Mr_Freeze

    Mr_Freeze Well-Known Member

    389
    373
    63
    Interested to know if you run 235's on the back, does this not alter the rolling circumference of the rear and mess up the gearing?
     
  24. Kelza

    Kelza MODERATOR Staff Member Moderator Audi RS3

    3,069
    597
    113
    Mr freeze john was running winters ,235 up back :)
     
  25. P_G

    P_G Active Member

    379
    86
    28
    There is only a 1.1% difference inbetween 235/35 and 225/35 thus should adversley affect anything else
     
  26. JonnyG

    JonnyG Active Member

    227
    67
    28
    It actually makes the fronts and backs the same rolling circumference !
     
  27. Mr_Freeze

    Mr_Freeze Well-Known Member

    389
    373
    63
    Yeah i know that, but if the car is designed to run 235/225 then the gearing will have been designed to take into account that the rear wheels are spinning faster, therefore by running 235 rear the wheels will be rotating slower than design spec.
    Would this not put extra strain on the diff as it will be not balanced as per spec?
     
  28. P_G

    P_G Active Member

    379
    86
    28
    I would suggest that a 1.1% difference is well within tolerance.
     

Share This Page