Speedometer 5 MPH off? - Harley Davidson Forums: Harley Davidson Motorcycle Forum
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post #1 of 16 (permalink) Old 11-25-2012, 04:12 PM Thread Starter
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Speedometer 5 MPH off?

I have an 08 Softail and I think the tank speedometer is reading 5 miles faster than I'm traveling. Just wondering if anyone else has experienced the same issues. I just know that it seems that I need to go about 5 miles over to match other riders speed.

Now I understand why dogs hang their heads out the window!
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post #2 of 16 (permalink) Old 11-25-2012, 05:53 PM
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My 07 Heritage is 2 MPH slower than actual speed.
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post #3 of 16 (permalink) Old 11-25-2012, 06:32 PM
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Originally Posted by hdrider67 View Post
I have an 08 Softail and I think the tank speedometer is reading 5 miles faster than I'm traveling. Just wondering if anyone else has experienced the same issues. I just know that it seems that I need to go about 5 miles over to match other riders speed.
Check it with a GPS.
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post #4 of 16 (permalink) Old 11-25-2012, 06:42 PM
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If you don't have a GPS, you can test it using a watch and the mile markers on the interstate. That is how I have always done it.


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post #5 of 16 (permalink) Old 11-25-2012, 07:05 PM
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According to my GPS my speedometer reads 3 mph fast.
Confirmed by a second GPS.

Like Chasarms said:
60 mph = 1 mile (mile marker to mile marker) a minute.

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post #6 of 16 (permalink) Old 11-25-2012, 07:17 PM
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Most if not all motorcycles read 3-12% ( I've seen Honda and Yamahas that read 12% higher) higher/faster than actual speed. Asian bikes higher than US bikes. I'm not sure if its for a liability issue or what, but I've seen it repeatedly.

http://www.popularmechanics.com/_mobile/cars/how-to/4260708

This article suggests they read higher to show faster top speeds. Regardless, I used to bust guys repeatedly on the race bike forums who would brag about driving 150 mph when in reality, they were only riding 132 mph.

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post #7 of 16 (permalink) Old 11-26-2012, 07:13 AM
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Originally Posted by hdrider67 View Post
I have an 08 Softail and I think the tank speedometer is reading 5 miles faster than I'm traveling. Just wondering if anyone else has experienced the same issues. I just know that it seems that I need to go about 5 miles over to match other riders speed.
I had the opposite issue after changing to an aftermarket 6 speed. I used the Dakota Digital speedo calibration unit and it works perfectly. I used my GPS to find 100kph, then used the DD unit to correct my speedo to that. Around a $100, but, like I said, I works perfectly.
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post #8 of 16 (permalink) Old 12-02-2012, 12:22 PM Thread Starter
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Thanks to all of you! I now have a few options to check out. I have to try the GPS check... as soon as the weather will permit a ride.

Now I understand why dogs hang their heads out the window!
13' Electra Glide Ultra Limited
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post #9 of 16 (permalink) Old 12-02-2012, 02:19 PM
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According to my GPS, my speedo is +3 at 70 meaning when I'm indicating 70, I'm doing 67., at 73, I'm doing 70 and so forth. Below 50 it sort of tapers off so that I'm like +2 at 45.

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post #10 of 16 (permalink) Old 12-02-2012, 02:55 PM
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Quote:
Originally Posted by chris_lacey View Post
I had the opposite issue after changing to an aftermarket 6 speed. I used the Dakota Digital speedo calibration unit and it works perfectly. I used my GPS to find 100kph, then used the DD unit to correct my speedo to that. Around a $100, but, like I said, I works perfectly.
I have the same issue with my six speed, once calibrated do you leave the DD unit in the wiring harness?
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