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

Tyres

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by JamesS4cab, May 16, 2008.

  1. JamesS4cab
    Offline

    JamesS4cab Well-Known Member

    Joined:
    Mar 4, 2008
    Messages:
    1,137
    Likes Received:
    87
    Been offered some dirt cheap 22/45/18 W Bridgestone RE040's.

    I am currently running ****€ budget FULLRUN tyres but they are 235/40/18Y's and are terrible in the wet.

    Am I going to cause any problems buying the Bridgestones??? :sorry:
    #1
  2. rashpal1
    Offline

    rashpal1 Member

    Joined:
    Jul 13, 2004
    Messages:
    60
    Likes Received:
    0
    As long as you change all four, there will be no problems.. Chaning two only will mean you have more grip either at the front or rear depending where you put them on..

    Not the best thing to be doing in my opinion... i think you can get away with fitting 225/40/18 without any problems..
    #2
  3. steve_malton
    Offline

    steve_malton Member

    Joined:
    Aug 13, 2007
    Messages:
    68
    Likes Received:
    0
    22/45/18 W? Jesus they are skinny :jump:
    #3
  4. AndyMac
    Offline

    AndyMac Moderator Staff Member Moderator

    Joined:
    Jun 10, 2003
    Messages:
    9,833
    Likes Received:
    30
    225/45/18's will be way out on rolling radius (approx 4.5% too big). 225/40/18's are the correct size.
    #4
  5. bubstar
    Offline

    bubstar Member

    Joined:
    Jul 8, 2004
    Messages:
    550
    Likes Received:
    0
    235/40R18 is the OE size for an 18x8 inch wheel on an A/S4.

    225's are too small and what you get in the cheap replica packages.
    #5
  6. AndyMac
    Offline

    AndyMac Moderator Staff Member Moderator

    Joined:
    Jun 10, 2003
    Messages:
    9,833
    Likes Received:
    30
    Please don't start this argument again.
    The original 16" alloys on a B6 are 205/55/16's (RR of 632mm), the closest to that rolling radius are 225/40/18's which are 5mm larger (+0.8%)
    235/40/18's are 13mm larger (+2%)

    Either will do the job, but 225's are the closest to the OE rolling radius, end of story.
    Replica wheels come in this size because it's the correct size, nothing to do with cost, 235's are no more expensive.
    #6
  7. chasdrury
    Offline

    chasdrury Member

    Joined:
    Jan 26, 2005
    Messages:
    284
    Likes Received:
    6
    So why did Audi put 235/40 on SLine B6 & 7 from the factory that had 18" alloys?

    Chas
    #7
  8. quattrojames
    Online

    quattrojames Moderator Staff Member Moderator

    Joined:
    Mar 28, 2008
    Messages:
    13,888
    Likes Received:
    475
    I have 215/55 x 16 fitted to mine as original equipment :think:
    #8
  9. chasdrury
    Offline

    chasdrury Member

    Joined:
    Jan 26, 2005
    Messages:
    284
    Likes Received:
    6
    From experience, 235/40 are more expensive than 225/40. For instance, on blackcirlces.com

    Michelin PS2's - 225/40/18 (Y)XL = £127.24
    Michelin PS2's - 235/40/18 (Y)XL = £158.00

    Bridgestone RE050A - 225/40/18 (Y)XL - £110.79
    Bridgestone RE050A - 235/40/18 (Y)XL - £133.76

    Pirelli P Zero Rosso - 225/40/18 (Y)XL - £101.80
    Pirelli P Zero Rosso - 235/40/18 (Y)XL - £137.33

    So, 225 are certainly not the same price as 235's..

    Chas
    #9
  10. chasdrury
    Offline

    chasdrury Member

    Joined:
    Jan 26, 2005
    Messages:
    284
    Likes Received:
    6
    Which a rolling radius of - 642mm

    235/40/18 is 645mm
    225/40/18 is 636mm

    So the 235 is nearer. That's assuming that 215/55/16 is OEM - since I know 235/40/18 is factory fit for SLines, I'd say 215/55/16 is correct too...

    Chas
    #10
  11. Osnim
    Offline

    Osnim New Member

    Joined:
    Mar 19, 2008
    Messages:
    4
    Likes Received:
    0
    Not sure what model you are running, however just been through a similar experience.... I have S4 B6, and have just had to replace tyres.... On checking internet / local tyre dealers could pick up tyres at nearly 1/2 price of premium brands, which was a real temptation... bottom line if your running a powerful car, fit decent rubber.. I put on Contis, and have to say am happy that I did.. On my previous car ( scooby) I put on cheap rubber and noticed a big difference ( which is borne out in tyre reviews), so felt a bit shortchanged... it might cost extra but worth it...

    size - 235 / 40 / 18 .... S4 B6...

    J
    #11
  12. 1.8JT
    Offline

    1.8JT Boots Electric

    Joined:
    Oct 19, 2007
    Messages:
    45
    Likes Received:
    0
    My 04 190 s-line came from factory with michelin PS2's 235/40/18 thisis OE.
    #12
  13. AndyMac
    Offline

    AndyMac Moderator Staff Member Moderator

    Joined:
    Jun 10, 2003
    Messages:
    9,833
    Likes Received:
    30
    Goodyear F1's 225's = £101
    Same in 235 = £111
    So okay 10% more expensive, hardly an issue, more to do with 225's being more popular than anything else.
    I'm talking about A4's which came as standard with 16" rims here folks, don't believe 16" rims were an option on an S4, it has a different gearbox for starters so can't really be used as the benchmark.
    215/55/16's are definately not the correct stock size.
    #13
  14. quattrojames
    Online

    quattrojames Moderator Staff Member Moderator

    Joined:
    Mar 28, 2008
    Messages:
    13,888
    Likes Received:
    475
    Where are you getting your information from?

    I have that exact size on my car, the handbook sayes that and so does the little sticker on the B pillar inside the driver door shut :think: So they are definately the correct size for my car as fitted from the factory.
    #14
  15. scottyjohn
    Offline

    scottyjohn Member

    Joined:
    Oct 9, 2007
    Messages:
    54
    Likes Received:
    0
    My B6 Avant came factory with 17" audisport alloys and have 235/45/17s as standard if it helps anyone! :laugh:
    #15
  16. AndyMac
    Offline

    AndyMac Moderator Staff Member Moderator

    Joined:
    Jun 10, 2003
    Messages:
    9,833
    Likes Received:
    30
    As already said (many times) 205/55/16's are the stock tyres on my B6 TDi130, my mates Passat and another mates B6, and my B5 quattro. I know this to be the stock size as the spare has never been used, and it also refers to it in the handbook.
    If you have a B6 with a 6 speed gearbox then obviously the ratios will be different so will accomodate the slightly bigger tyre. As also said before you can fit either regardless as they are both within the +/- 2.5% recommendation, but on a stock 5 speed 225/40/18's are a closer match.
    Quattrojames - you have a 6speed box on a 2.5Q IIRC
    On re-reading the original thread I now realise/assume the guy has an S4cab, but couldn't believe anyone would fit non-branded tyres to such a vehicle (they should be shot), so apologies as obviously the 16's I referred to are not relevant.
    #16
  17. quattrojames
    Online

    quattrojames Moderator Staff Member Moderator

    Joined:
    Mar 28, 2008
    Messages:
    13,888
    Likes Received:
    475
    Yes I do.

    Probably my fault for not reading the whole thread thoroughly, I guess 205/55/16's are the stock size for some A4's, but worth clarifying that not all A4's with 16" wheels run this size.

    :thumbsup:
    #17
  18. NOLOGY
    Offline

    NOLOGY AUDI OWNER

    Joined:
    Feb 29, 2008
    Messages:
    101
    Likes Received:
    4
    KAHN which is a very reputable wheel maker, when i boutht my RSV told me fit them with 235/40/18!!! END OF STORY!!!!
    #18
  19. jase0851
    Offline

    jase0851 Member

    Joined:
    Oct 8, 2004
    Messages:
    784
    Likes Received:
    1
    i thought when it comes to tyres 235= width 40= profile and 18=size of the wheel. the width has no bearing what so ever on the rolling diameter
    #19
  20. Issac Hunt
    Offline

    Issac Hunt Active Member

    Joined:
    Jan 6, 2007
    Messages:
    1,162
    Likes Received:
    0
    The profile is a % measurement, width is in mm.

    So as I understand it 225/40/18 must have a different(slightly) rolling radius from a 235/40/18.
    #20
  21. J7USS
    Offline

    J7USS Shuddup Foooool!!

    Joined:
    Oct 25, 2006
    Messages:
    3,683
    Likes Received:
    1
    If you have 225/40 and a 235/40 on a for example 8J wheel, the 235 width will add a slight more depth to the wall.We're not talking loads but adds to the % rolling radius.
    For example..225/40 on a 9J wide alloy will look lower profile than it would on a 8J because the tyre on the 9J has had to stretch out wider if you catch my drift..:think:
    #21
  22. AndyMac
    Offline

    AndyMac Moderator Staff Member Moderator

    Joined:
    Jun 10, 2003
    Messages:
    9,833
    Likes Received:
    30
    40 is 40% of the width, so the width is critical when calculating the rolling radius
    #22
  23. ozique
    Offline

    ozique Member

    Joined:
    Feb 10, 2007
    Messages:
    49
    Likes Received:
    0
    what about 245/40/18 on 8x18 wheels? too wide or should be ok?
    #23
  24. jase0851
    Offline

    jase0851 Member

    Joined:
    Oct 8, 2004
    Messages:
    784
    Likes Received:
    1
    i think 245 might be to wide mate
    #24
  25. J7USS
    Offline

    J7USS Shuddup Foooool!!

    Joined:
    Oct 25, 2006
    Messages:
    3,683
    Likes Received:
    1
    @ Ozique,Id say 245 are too wide...
    Does your profile look Bigger than a 40??
    #25

Share This Page