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Larger wheels at last (I hope)

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by madba, Feb 11, 2008.

  1. madba

    madba New Member

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    Hi guys, a quick wheel question from someone with not a lot of experience in this area. I'm thinking of changing my embarrassing 195/65R15 wheels to a set of RS6's with 225/40R18's on them. I am aware that there will be a slight difference in the rolling circumferences and was wondering to what extent this will effect speedo readings???? I presume there a way to programme in the new tire size so as to keep the speed reading true???

    Thanks
     
  2. Carpy25

    Carpy25 Member

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  3. chris_20

    chris_20 Member

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    doesnt make any difference- well not tha i noticed anyway and i went from 15' to 19s
     
  4. 1wheelonly

    1wheelonly cabriolet
    VCDS Map User

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    It stays the same, what you go up in size on the alloys you go down on the wall / profile of the tyre.
    :icon_thumright:
     
  5. 1210tech

    1210tech Four Ring Fanatic

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    if you put the 15's next to the 18's with the tyres fitted you will notice that they will be quite a bit bigger but it shouldn't affect the speedo by much. when i upgraded mine from 15" to 18" it knocked the speedo out by about 4mph
     
  6. james0808

    james0808 Active Member

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    I went from 15's to 18's to 19's and my speedo got more accurate compared to my sat nav.
     
  7. madba

    madba New Member

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    cheers guys been very helpfull :icon_thumright:
     

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