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

Tuning & Tyre widths

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by Platinum70, Nov 19, 2006.

  1. Platinum70
    Offline

    Platinum70 Member

    Joined:
    Jun 5, 2004
    Messages:
    194
    Likes Received:
    0
    [Nov 19, 2006]
    Firstly - has anyone heard of RICA engineering software. Seems very popular with Volvo, Ford and Mazda, but they also do all the VAG cars and many others.

    Secondly - can you change tyres for a slightly wider width and if so by how much so as not too have an adverse affect? Still using the same rims.
    #1
  2. Ads

    Ads

    [Nov 23, 2014]

  3. VennyQuattro
    Offline

    VennyQuattro Member

    Joined:
    Nov 25, 2006
    Messages:
    52
    Likes Received:
    0
    [Dec 4, 2006]
    There is usually scope for a small width increase, the standard tyre sizes on my 2,5TDiQ are 235/45/17s and the pervious owner has fitted 245s and they seem fine.
    #2
  4. tommyt2
    Offline

    tommyt2 Member

    Joined:
    Jul 24, 2006
    Messages:
    97
    Likes Received:
    0
    [Dec 5, 2006]
    im using 235/40/19s on my 2.5q sport nice side wall and plenty of comfort compared to the usuall 235/35/19 no rubbing or arching only thing is with the 40 profile in this size no one makes them except bridgestone and this size potenza (re050a) isnt cheap 265 euro plus the vat 21% ouch:puke2:
    #3
  5. Marko
    Offline

    Marko Member

    Joined:
    Oct 9, 2005
    Messages:
    202
    Likes Received:
    0
    [Dec 5, 2006]
    There is a trade off between width and handling. There was a very good article in Audi driver re the effect of oversized widths and rims. Some people are actually sacrificing handling and performance for sheer looks! Crazy in my opinion. The wider you go the better lateral grip will be but aqauplaining will become more of an issue.
    #4
  6. VennyQuattro
    Offline

    VennyQuattro Member

    Joined:
    Nov 25, 2006
    Messages:
    52
    Likes Received:
    0
    [Dec 5, 2006]
    Bear in mind that if you increase the profile, you are increasing the running diameter of the wheel which will have an effect on the speedo calibration.

    General rule of thumb:

    16" = 50 profile
    17" = 45 profile
    18" = 40 profile
    19" = 35 profile

    to keep ~ the overall same running diameter
    #5
  7. arthurfuxake
    Offline

    arthurfuxake Controversial & Contradictive

    Joined:
    Mar 16, 2004
    Messages:
    1,308
    Likes Received:
    0
    [Dec 5, 2006]
    Umm, I'd be careful with a generalisation like that.

    a 165/55/16 will not have the same rolling diameter as a 235/55/16 even though the sidewall profile is the same (number wise at least ie 55) The profile number refers to a percentage (50%, 45%, 35%) of the width (195, 205, 235) which is in millimeters.

    Hope that makes sense?:wtf:
    #6
  8. jdp1962
    Offline

    jdp1962 Grumpy Old Moderator Staff Member Moderator

    Joined:
    May 26, 2003
    Messages:
    5,977
    Likes Received:
    887
    [Dec 5, 2006]
    #7
  9. Donald_MacIver
    Offline

    Donald_MacIver Member

    Joined:
    Feb 26, 2005
    Messages:
    202
    Likes Received:
    1
    [Dec 5, 2006]
    I would have though a 16" wheel would have a 55 profile tyre rather than a 50 if fitted to an A4.
    #8

Share This Page