Speedo Accuracy
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Extreme HDF Member
Joined: Oct 2008
Posts: 15,321
Likes: 29
From: Phoenix, Arizona
Speedo Accuracy
Was riding with my Garmin Nuvi and noticed there is a difference in what the speedo reads versus what the GPS reads.
Speedo says 65, GPS reads 62
Speedo says 75, GPS reads 71
Looks to be about 3-4mph difference at highway speeds.
Which is correct?
Speedo says 65, GPS reads 62
Speedo says 75, GPS reads 71
Looks to be about 3-4mph difference at highway speeds.
Which is correct?
Cruiser
Joined: Apr 2007
Posts: 232
Likes: 1
From:
The GPS is probably right on. My 08 ultra is way off too. When the speedo shows 72 I am going perhaps 67. I asked my dealing thinking that 5% was the norm and this is closer to 7% and he told me that the factory spec was 7%! So I was in spec! There is no adjustment I was told and the only fix was to replace the speedo and since in spec the factory would not cover it.
On my 07 Softail the GPS and the speedo are within a 1/2 mile per hour. So essentially right on.
So trust the GPS. I am surprised that the factory speedo is not more accurate, this is simple stuff to get right. I have better speedo accuracy on my 66 mustang!
On my 07 Softail the GPS and the speedo are within a 1/2 mile per hour. So essentially right on.
So trust the GPS. I am surprised that the factory speedo is not more accurate, this is simple stuff to get right. I have better speedo accuracy on my 66 mustang!
Seasoned HDF Member
Joined: Jul 2007
Posts: 6,336
Likes: 67
From: SW Minnesota
Dakota Digital and Kuryakin both have electronic speedometer calibrators for Harleys, for around $110.
Here's a scale you can use to check yours. Use the second hand on your watch and mile markers on the road for a rough estimate .
Here's a scale you can use to check yours. Use the second hand on your watch and mile markers on the road for a rough estimate .
Cruiser
Joined: Feb 2008
Posts: 207
Likes: 1
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Ultimate HDF Member
Joined: Dec 2006
Posts: 5,878
Likes: 17
From: The Desert SouthWest
This very topic has come up several times in the past. When polls have been taken here I've noticed that most commonly the speedo reads 3 mph UNDER what the GPS reads. My bike is exactly that also.
Trust the GPS it's far more accurate.
Trust the GPS it's far more accurate.
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Joined: Aug 2007
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From:
I was headed to florida with I notice the same thing...rolling @ what I thought was 80, Gps was reading 76...at fuel stop ask my buddy what his wing was reading and stated 75 on his Gps 80 on the speedo....Cool...