Fixing speedometer after wheel size change?
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    1. #1
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      Fixing speedometer after wheel size change?

      What do people do here when switching between winter/summer wheels when they are sized differently? Do you just get used to the wrong speedometer/odometer reading for half the year? Or is this something a shop or dealer can fix?

      If this can be fixed by a shop, any idea which tool/software they use for it?

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    3. #2
      Member partridge's Avatar
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      Quote Originally Posted by whoami View Post
      What do people do here when switching between winter/summer wheels when they are sized differently? Do you just get used to the wrong speedometer/odometer reading for half the year? Or is this something a shop or dealer can fix?

      If this can be fixed by a shop, any idea which tool/software they use for it?
      If you pair the wheel/tire combo properly the difference is negligible.

      I use a calculator like willtheyfit.com

      Just enter in your parameters and you can get the %error. It’s usually not worth bothering about.


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    4. #3
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      Willtheyfit shows it's off by about 3.5mph - which matches the difference I feel when driving.

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    6. #4
      Member partridge's Avatar
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      Quote Originally Posted by whoami View Post
      Willtheyfit shows it's off by about 3.5mph - which matches the difference I feel when driving.
      Wow. What did you switch to?


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      Astrid: 2015.5 Sapphire Black/Nubuck XC60 T6 AWD R-Design Platinum BLIS Climate Polestar

    7. #5
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      From 21" Pirelli Verde to 19" Andros w/ 235/55 Blizzaks dm-v2.

      I'll need to double check dimensions on the 21" wheels, but I believe I got them right (275/45).

    8. #6
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      That seems excessive size difference. Wasn’t there closer fit tire size? In any case as far as I know from reading around vida at dealers has a setting for the Speedo adjustment. Not sure if that is available through the 3day subscription.


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    9. #7
      Member chillg8r's Avatar
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      I bought larger wheels and tires from my dealer and he told me that they would have to input the change into the computer so the speedo was correct, so its valuable and doable. It didn’t seem to take significant time either.


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    10. #8
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      Awesome, that's promising to hear. Will talk to the dealer then. Thanks!

    11. #9
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      It's not as easy as changing a setting, the dealer has to download and install a new piece of "software". For the 21" wheels, the Part Number is 32270048. I was charged $37.50 for the software, plus 1/2 hour of labor.
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    12. #10
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      Are you sure the original size isn't 275/40R21?

      Your snow tire size 235/55/R19 is a standard size for the Momentum. Both of these tire sizes are standard and only 1.7% different in circumference, so you shouldn't need to make any speedometer adjustments.
      2016 XC90 T6 Momentum Plus, Vision, Climate, CarPlay, Invisihitch

    13. #11
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      Quote Originally Posted by SDspeed View Post
      Are you sure the original size isn't 275/40R21?

      Your snow tire size 235/55/R19 is a standard size for the Momentum. Both of these tire sizes are standard and only 1.7% different in circumference, so you shouldn't need to make any speedometer adjustments.

      I was told the software has more to do with the power steering parameters of switching from 235 to 275mm wide tires than the speedometer accuracy (although it adjusts that, too)
      Hers: 2018 XC90 T6 AWD - Momentum - White/Black [OSD May-2018]
      Mine: 2018 Audi A6 2.0T Quattro - Premium Plus - White/Brown
      Also Mine: 1995 Land Rover Defender 90 - Soft Top - White/Black

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