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2020 GXL Speed Change /Tyre size

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  • 2020 GXL Speed Change /Tyre size

    We have just traded our 2011 150 in for a 2020. with the old one, by upgrading the 265/65, to 265/70 tyres, the speedo was correct. The new one is all electronic, can anybody tell me if doing the same tyre upgrade on the 2020 model, will the speedo/gps , still be correct. It is spot on with the factory 265/65 tyres. Thanks.

  • #2
    The bigger size is about 5% different so if it is spot on now(unusual) you will be doing 105 when Speedo says 100. Check with a sat nav and or an app or 2


    • #3
      Yes, the same tyre upgrade will still affect the true speed as before. Electronic or mechanical speedo doesn’t change this.

      as 404pug said, use a gps to confirm true speed.


      • #4
        My Oct 2018 build VX speedo reads 5% low at 100km/hr with the standard 265/60/18s, with the set of 265/70/17 Yoko LTs I have for outback touring fitted the speedo is accurate at 100 km/hr however the odometer reads under for distance covered. That the odometer is accurate but the speedo is not is something I have found regularly with late model cars, I believe it is the manufacturers designing in an fudge factor to ensure they meet ADRs re speedo accuracy.
        '18 VX, Billies with Dobinson springs, Summit bar with Narva Enhanced Optics to help my old eyes


        • #5
          Every vehicle is different, only way to know exactly is to try it. Last one I did (2019) going to a 70 series saw the speedo go over. 110 indicated was 113 in real life. Whereas the 2014 I did was dead accurate. My 2006 was also over by 3kmh.