Speedometer Accuracy
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Novice
Joined: May 2008
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Speedometer Accuracy
I have a 2008 road king classic & note that when I pass a police stand displaying my speed it says I am going @ 5 mph slower than my speedometer reads. I have stock wheels & tires. What are your experiences with the speedometer accuracy?
Cruiser
Joined: Dec 2007
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RE: Speedometer Accuracy
Same as yours. \\; Mine runs between 5 and 10% slow Odometer is also off \\; i use the GPS for both. \\; That also throws the MPG off to the high side if you use the odometer.. \\;
Outstanding HDF Member
Joined: Jul 2007
Posts: 2,609
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From: Indy area
RE: Speedometer Accuracy
It should be a linear percentage. If you read 4 over at 60 it should be 2 over at 30. This, unless your needle reads 4 at 0 and it is 100% accurate. 
http://en.wikipedia.org/wiki/Speedometer_Error#Error
http://en.wikipedia.org/wiki/Speedometer_Error#Error
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Road Warrior
Joined: Oct 2006
Posts: 1,830
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From: Retired and living in the mountains of NE PA
RE: Speedometer Accuracy
Your experience is typical. My speedometer reads 3-4 mph slower than my actual speed as indicated by my GPS unit at normal cruising speeds 60-70 mph. From about 50 mph and slower, the speedometer error is negligible.
P.S.- Are you sure that signature photo of your bike is big enough? \\;
->\\;\\\\\\;\\\\\\\\\\\\\\; \\;\\\\\\;\\\\\\\ \\\\\\\; *DISCLAIMER* - Your signature picture can NOT exceed 500x250 in size. Any pictures that do will be subject to removal by the admin.
https://www.hdforums.com/m_834910/mp.../tm.htm#834910
P.S.- Are you sure that signature photo of your bike is big enough? \\;
->\\;\\\\\\;\\\\\\\\\\\\\\; \\;\\\\\\;\\\\\\\ \\\\\\\; *DISCLAIMER* - Your signature picture can NOT exceed 500x250 in size. Any pictures that do will be subject to removal by the admin.
https://www.hdforums.com/m_834910/mp.../tm.htm#834910
Extreme HDF Member
Joined: Dec 2006
Posts: 10,045
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From: ST. Louis
RE: Speedometer Accuracy
My Street Glide is the same.
Street Glide - 70
GPS (Garmin 760) - 68
 \\;
I put the GPS in the wife's '08 \\;Buick Enclave while on a trip last week
and the GPS and the Buick was dead even.
Buick - 70
GPS - 70
 \\;
I guess this means I'm actually getting better gas milage than I thought.
Street Glide - 70
GPS (Garmin 760) - 68
 \\;
I put the GPS in the wife's '08 \\;Buick Enclave while on a trip last week
and the GPS and the Buick was dead even.
Buick - 70
GPS - 70
 \\;
I guess this means I'm actually getting better gas milage than I thought.