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Speedo Compared To Garmin Speedo

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  #31  
Old 10-27-2009 | 01:48 PM
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my 08 ultra speedo reads about 2mph faster than the gps
 
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  #32  
Old 10-27-2009 | 01:50 PM
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Very common issue. The GPS is the more reliable of the two. Supposedly a built in error - to account for variances in tire diameter (due to manufacturing tolerance or wear).

Some of my Japanese bikes have been off (low) by as much as 10%.
 
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  #33  
Old 10-27-2009 | 07:17 PM
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Originally Posted by jeepster
The warranty is based on TIME not miles.
heh, figures...
not good at math or legalities.
 
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  #34  
Old 10-27-2009 | 08:14 PM
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07 touring with E 3 tire, reads 62 MPH indicated @ 60 MPH actual. Had a Tom Tom taped to mirror checking speedo.
 
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  #35  
Old 10-27-2009 | 08:35 PM
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Originally Posted by HarleyWood
my bike speedo is always 3 mph faster than the GPS, no matter what speed, its always 3 mph difference.

The same GPS in both my cars reads the same speed between the speedo and GPS.
Dang - so when you're parked the bike says 3mph?
 
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  #36  
Old 10-28-2009 | 02:21 PM
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I am in this industry having worked with GPS since its inception. I have a Zumo 550 and an 09 FLHTC. The Garmin indicates 77 while the HD speedo shows 80.
The GPS sats are accurate to within +/- 2 TENTHS of a mph.
I have learned to use the Zumo's numbers.

Regards,
Sunrider00
 
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  #37  
Old 10-28-2009 | 03:36 PM
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Mine varies depending on the tire wear. It is most accurate about mid life on the tire...
 
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  #38  
Old 10-28-2009 | 04:07 PM
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Originally Posted by Beeracuda
Mine varies depending on the tire wear. It is most accurate about mid life on the tire...
That seems opposite of what others are posting. The smaller the circumference of the tire should make the speedo read faster. So your speedo is reading slower than the GPS when the tire is new?
 
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  #39  
Old 10-28-2009 | 04:50 PM
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Originally Posted by nvsteve
That seems opposite of what others are posting. The smaller the circumference of the tire should make the speedo read faster. So your speedo is reading slower than the GPS when the tire is new?
I'll have to tell you when I get a new tire....
 
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  #40  
Old 10-28-2009 | 05:14 PM
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Mu Ultra reads about 4 mph slower than my TomTom. My brothers BMW is a bit closer. The other issue I noticed is that on the same trip; my Ultra and my brothers BMW clocked different mileage; so I have no idea which is correct.
 
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