Speedometer inaccurate
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Tourer
Joined: Feb 2017
Posts: 379
Likes: 102
From: Illinois
Speedometer inaccurate
Hey all. I've driven through two separate construction zones and those radar speed readers put my bike at 3 mph less than my speedometer. I was also running Google maps one day and it also read 3 mph less than my speedometer. So is there a way to test or calibrate without going to the dealer? Any reason why or what could have caused it to get off?
Thanks now for the advice
Thanks now for the advice
Intermediate
Joined: Jul 2019
Posts: 42
Likes: 17
From: Southeastern Kentucky
I dont think Ive ever owned a bike with an accurate speedometer. I havent checked the one I have now, but the last 3 were about 5 mph slower than stated, I even put air in the tires now and then 
Grand HDF Member
Joined: Sep 2017
Posts: 3,835
Likes: 988
From: Southern Virginia
I have the same problem with my 2010 Ultra Classic. The thing is the faster I go the further off it is. When it says 75 I am only doing 70. The dealer says they cannot adjust it with the Digital Technician. If you have a different model maybe they can help you, I don't know. I wonder if this is why so many folks think bikes from that era are "over geared". They are actually going a good bit slower than the speedometer is reporting.
On my 2003 FXDWG I regeared the bike and used a module from Dakota Digital to calibrate the speedo. It was very easy to do using a GPS speedometer on my phone. They offer a module for my 2010 U.C. but it requires cutting into the wiring harness which I am not keen to do. I have just learned to live with it now that I know how far off it is.
You could check Dakota Digital's website to see if they offer a solution for your bike that you might like:
Speedometer Calibration Devices
Good luck.
On my 2003 FXDWG I regeared the bike and used a module from Dakota Digital to calibrate the speedo. It was very easy to do using a GPS speedometer on my phone. They offer a module for my 2010 U.C. but it requires cutting into the wiring harness which I am not keen to do. I have just learned to live with it now that I know how far off it is.
You could check Dakota Digital's website to see if they offer a solution for your bike that you might like:
Speedometer Calibration Devices
Good luck.
H-D is pretty tight on not letting the bike be faster than the reading, but gives a few percent the other way. At least that's the story I got when I asked that same question when I worked in tech there.
Last edited by Ed Ramberger; Aug 3, 2019 at 06:19 PM.
Grand HDF Member
Joined: Sep 2017
Posts: 3,835
Likes: 988
From: Southern Virginia
Y'all have peaked my interest with the tuner thing. I use the old original Screamin Eagle Pro Super Tuner to tune my bike. I wonder if it would be possible to use a PowerVision tuner to just adjust the speedo and then drop back to my SEPST for regular tuning?
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