Speedometer Error Fix?

Discussion in 'Touring Models' started by Rod Stewart, Aug 10, 2009.

  1. Rod Stewart

    Rod Stewart Active Member

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    I have noticed for quite a while now that my speedo reads about 5% high at most speeds compared to my GPS.
    Can this be corrected or recalibrated??

    Thanks,
    Rod
     
  2. dhorne

    dhorne Active Member

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    you will also find that most GPS are out 3 mph as a rule of thumb or used to be anyway
     
  3. glider

    glider Veteran Member

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    Very few speedos are dead on, they usually are off by a number of MPH. Nothing much can be done without going crazy. Even tire pressure will effect the readings.
     
  4. fin_676

    fin_676 Experienced Member Staff Member Moderator Contributor

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    speedo is allowed to show a little higher than actual speed by up to 10%
    but not allowed to show lower than actual speed
    even if you managed to get the speedo spot on for speed youd have to change the tyres frequently cos as the tyres wear the rolling radius of the wheel is reduced so although the wheel is turning at the same speed you go less distance so a speedo can never be 100% accurate
    at an indicated 60 mph id expect real speed to be between 56 and 58 mph depending on current wear on the tyre

    Brian