How are miles on the odometer calculated?
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Seasoned HDF Member
Joined: Sep 2009
Posts: 17,145
Likes: 6,168
From: SE Michigan
How are miles on the odometer calculated?
I have a 2012 Road King, buddy has a 2005 Road King Police.
On a trip this weekend, when we filled up, we both zero'ed out Trip A.
Ride some more and fill up again.
My trip odometer would say something like 134 miles, his would say 130.
Only thing I can think of is that I've replaced my front wheel with a 17", while stock 2012 RK's are 16".
Is that the reason?
On a trip this weekend, when we filled up, we both zero'ed out Trip A.
Ride some more and fill up again.
My trip odometer would say something like 134 miles, his would say 130.
Only thing I can think of is that I've replaced my front wheel with a 17", while stock 2012 RK's are 16".
Is that the reason?
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Seasoned HDF Member
Joined: Sep 2009
Posts: 17,145
Likes: 6,168
From: SE Michigan
Does calibrating the speedo affect the odo miles?
Elite HDF Member
Joined: Sep 2007
Posts: 4,928
Likes: 69
From: Near Myrtle Beach, SC
The speed sensor is located in the rear top of the transmission. Anything or any change in the drive train can affect the signal sent to the speedometer by the speed sensor. Changes in rear tire diameter (thus circumference) along with sprocket and pulley tooth count can slightly speed up or slow down the process measured by the speed sensor.
Your front tire is not part of this equation. Confirm actual miles driven and actual speed with GPS, then you will know what is what. Maybe you are right and your bud is wrong. But you won't know til you measure it with a gps.
Your front tire is not part of this equation. Confirm actual miles driven and actual speed with GPS, then you will know what is what. Maybe you are right and your bud is wrong. But you won't know til you measure it with a gps.
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Road Captain
Joined: May 2011
Posts: 505
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From: Houston
most ecu reprogrammers will let you adjust the speedometer. the sensor sends data to the ecu which calculates the speed and mileage based on a pre programmed constant. that constant can be changed.
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Thread Starter
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Seasoned HDF Member
Joined: Sep 2009
Posts: 17,145
Likes: 6,168
From: SE Michigan
Right, I get that, but does adjusting the speedo calibration adjust the rate at which odo miles accumulate?
Stellar HDF Member
Joined: Jun 2010
Posts: 2,553
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From: Sussex, South of England
I would say "yes". The speed and the odo will recieve their signal from only one sensor. So if the sensor gets calibrated it will affect both speed and accumulated mileage.
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