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Aftermarket wheels n tires affect speedometer accuracy

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  • Moderator
    nick34's Avatar
    10,509 posts since Jul '01
  • Unknown_X's Avatar
    1,642 posts since Jul '04
  • carbikebus's Avatar
    19,034 posts since Nov '03
    • For me if your standard rims is 15 inch and using stock engine(No major mods)better to upgrade by just 1 or the most 2 inch only.Only for certain models like my neighbour Proton Wira 1.5 which is 13inch stock rims upgrade to 15 as 1.5cc should be no problem fitting 15incher

  • 扎fit 人's Avatar
    38 posts since Feb '09
    • Use a lower profile tyre if you upgrade the rim size.

      On my previous ride, a honda jazz, i was using 17" rims. No issue there really.

  • Moderator
    nick34's Avatar
    10,509 posts since Jul '01
    • Tested out the calculator from 15" to 16" ... results as below

      185/60R15 to 205/45R16, there will be a 2% difference on the spedo..

      The site will show you what is the actual speed you are travelling at when your speedo shows 100km/h. For the above changes, you are actually travelling at 98km/h instead of 100km/h.

    • Originally posted by Unknown_X:

      sticky it?


      sticked.. but of cause if you guys think that it is not helpful .. just sound it out and this thread will be deleted

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