Knowing ur Speedo
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  1. #1
    Member brent morley's Avatar
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    Today I was riding and had my GPS on my bike and my speedo said 65 and the GPS said 60 so I guess whatever my speedo says I can pretty much take 5 miles an hour off that. Just wondering if anyone else's bike does the same.
    I got granny gear haha...

  2. #2
    Senior Member PJungnitsch's Avatar
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    Mine did the same thing, might have even been more. Used to wonder why traffic was piling up behind me in town when I was going the 'allowable' over the speed limit.



    That's one advantage of switching to a Vapor or other accessory speedo, you can set it exact. Afterwards the top speed doesn't sound as impressive though!

  3. #3
    Senior Member assquatch20's Avatar
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    On pretty much any of these old bikes it comes out to reading about 5 miles high at highway speeds. It's usually 2 or 3 miles high down at lower speeds, on a graduated scale sort of.

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  5. #4
    Senior Member dubstep's Avatar
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    10%?
    2001 TW200 - supertrapp stubby exhaust

    1996 CRM 250 - 2 smoker - FMF exhaust

    1998 Honda CB600 Hornet - ( a.k.a Honda 599 ) - micron , ohlins rear - CB600F3 front forks..

  6. #5
    Senior Member PalmStateCrawler's Avatar
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    Mines dead on with my gps. Must be a problem with the older models. Mines a 2010.
    '13 690 Enduro R too many frickin farkles...
    '07 KLX250 farkled (wife's bike)
    '86 BW80 farkled to size
    '10 TW200 you will be missed

  7. #6
    Senior Member Rainman's Avatar
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    Quote Originally Posted by dubstep View Post
    10%?




    Sounds about right. Your speed should be off proportionally throughout the MPH range.



    My 1990 is pretty much right on with my GPS.



    Do you have an aftermarket tire on your bike?
    If you can't find it, grind it

    1990 TW200

  8. #7
    Senior Member macbig2k1's Avatar
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    A after market tyre does not make 10% difference.

    The tyre must be 10% smaller (diameter) for this difference.



    I know it from all of my cars (VW Golf IV, Ford Mondeo/Contour, Ford Escort V and VI) and bikes (TW125, TW200, MZ Mastiff 660), that the real speed is 10% lower as the shown speed.

  9. #8
    Senior Member Rainman's Avatar
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    Brent,

    Try some more tests. Go 55, 50, 45, etc. on your bike and see what your GPS says. That will tell you your speedometer is off at all speeds and you can adjust accordingly.
    If you can't find it, grind it

    1990 TW200

  10. #9
    Member brent morley's Avatar
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    Quote Originally Posted by Rainman View Post
    Sounds about right. Your speed should be off proportionally throughout the MPH range.



    My 1990 is pretty much right on with my GPS.



    Do you have an aftermarket tire on your bike?
    My Bike is a 2008 and it has the stock tire on it.
    I got granny gear haha...

  11. #10
    Member brent morley's Avatar
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    Thanks guys. I will try your suggestions.
    I got granny gear haha...

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