Re: [St] Speedometer accuracy

[Matt Knowles <matt@xxxxxxxxxxxxxxxxxxx>]

That's far more accurate than my speedo.

When I first bought my '99 I complained to the shop that the speedo  
was wildly inaccurate. The let me borrow a GPS unit and it showed an  
indicated 50 was really only 45. An indicated 70 is only about 63.

I have a Rhino 120 (because that's what our fire dept bought and I  
like the idea of having the radio built in) and it clocks accurately.


On Apr 21, 2008, at 11:32 AM, Kevin Liske wrote:
> I recently borrowed a Garmin Rino 120 from work to take on a road  
> trip.  I
> put it on the trip computer settings.
> I had speed, max speed, average speed, odometer, and a few other  
> readings.
> It seemed that the Garmin odometer matched the bike odometer very  
> closely.
> I did notice that as my speed increased above 50mph, there was an  
> increasing
> variance in
> the readings of the bike speedo and the gps speedo.
>
> Bike     GPS
> 40        40
> 50        49
> 60        58
> 70        66
> 80        75
> 90        83
> 100      92
>
> I have two theories.  1)  The bike speedo is actually inaccurate at  
> high
> speed.
> 2)  The bike speedo is correct and this gps can not process the signal
> accurately
> enough to be correct while moving at high speed. (This is a hand unit
> designed for
> people walking around after all and just may not have the specs to  
> handle
> high speed.)
>
> Any thoughts?
> -- 
> Kevin Liske
> `03 Sprint
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Matt Knowles
Aesthetic Design & Photography - www.aestheticdesign.com - (707)  
786-4643


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