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  1. #1
    Active Member Two Rings
    Join Date
    Feb 25 2018
    AZ Member #
    My Garage
    02 S6, 03 RS6, 01 C5 4.2 6 speed, 02 Boxster, whole bunch of other cars
    Oxnard, SoCal

    02 S6 upsize wheel size question

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    02 S6 with factory 255/40/17 size tires and about to make the switch to 255/40/18s. 255/40/18 is RS6 factory size. Anything I need to change on VCDS?

  2. #2
    Senior Member Two Rings mr_dave's Avatar
    Join Date
    Apr 20 2013
    AZ Member #
    My Garage
    C5 RS6

    I ran that size on my S6 while I had it. Looked great and didn't have any issues. Speedo showed maybe 1-2 mph slow on the highway.

  3. #3
    Established Member Two Rings
    Join Date
    Feb 01 2017
    AZ Member #

    I run that size on my summer wheels...just because i already had the tires when I removed them from the RS6 wheels. Nothing you can do to the VCDS (as far as I know) but it gives about a 4% difference in circumference and it looks to be the case when I use Waze and it tells me I'm going 62-63 when my speedo says 60.

    It does fill out he wheel wells better though :D
    '02 S6 Avant
    '99.5 A4 2.8 Quattro Tip - GIAC engine and tip chip, Stage 3 MAF mod, A8 front rotors
    '64 356 SC
    '73 914 6-cyl conversion in progress


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