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?

 

I have an 08 UC and mine reads 70, radar sign thing shows about 67.

 

Same as yours.&nbsp\\; Mine runs between 5 and 10% slow Odometer is also off&nbsp\\; i use the GPS for both.&nbsp\\; That also throws the MPG off to the high side if you use the odometer..&nbsp\\;

 

Checked mine against a buddy riding a FXSTC and my&nbsp\\; gps. Both show my FLHX to be 5 MPH off. MY flhx reads 70 when the GPS says 65

 

Same here my GPS says I'm 3 MPH slower than indicated.
&nbsp\\;
Ride well,
&nbsp\\;
Jim

 

My 07 FLHTC reads 3 MPH faster than the GPS indicates. Seems to be pretty much the same accross the board.

 

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

 

Agreed,&nbsp\\; the slower I go, the more accurate the Odometer.

 

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?&nbsp\\;

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https://www.hdforums.com/m_834910/mp.../tm.htm#834910

 

My Street Glide is the same.
Street Glide - 70
GPS (Garmin 760) - 68
&nbsp\\;
I put the GPS in the wife's '08&nbsp\\;Buick Enclave while on a trip last week
and the GPS and the Buick was dead even.
Buick - 70
GPS - 70
&nbsp\\;
I guess this means I'm actually getting better gas milage than I thought.