Speedometer Accuracy...
Cruiser
Joined: Aug 2007
Posts: 137
Likes: 0
From: Iowa
mine seems to be reallyclose when i ride through the speed reading signs they have out but when i ride with friends they say they're going atleast 5mph slower than i am when they are behind me. i need to get the gps out to see if it's my bike or theres
There are three metric bikes here and next door, and my 07 Heritage Classic. All three metrics are reading 50 mph when the GPS reads 55 mph. The Harley reads 54 when the GPS reads 55. I have had a hard time convincing them to SPEED up. Traffic is passing at every opportunity and I can't get out of 5th gear....EVER!!!! Drives me NUTS.
Road Master
Joined: Apr 2009
Posts: 875
Likes: 1
From: Rochester, NY
Always check with a GPS or pay the price (speeding fine). Most are low, any change to tire size, brand or pressure differential can affect. I changed my ATV tires with the same size different brand and they were an inch higher and wider affecting the speedometer/odometer. Know the limits of your speedometer... like the parallax between a rifle bullet and the optics. Mine is off about 2-3 at 65 on the low side. I tend to ride the limit of ticket potential around here so 65 in a 55 has so far been OK... knock on wood.
Seasoned HDF Member
Joined: Jul 2007
Posts: 6,336
Likes: 67
From: SW Minnesota
Here's a chart we passed out to our MSF students, compliments of the Mn State Patrol. Take a stop watch with, and check against mile markers.
Dakota Digital makes an inline device for correcting Harley speedometers.
Dakota Digital makes an inline device for correcting Harley speedometers.
Thread Starter
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Road Master
Joined: Aug 2010
Posts: 848
Likes: 0
From: Fair Oaks, Caliphornia
There are three metric bikes here and next door, and my 07 Heritage Classic. All three metrics are reading 50 mph when the GPS reads 55 mph. The Harley reads 54 when the GPS reads 55. I have had a hard time convincing them to SPEED up. Traffic is passing at every opportunity and I can't get out of 5th gear....EVER!!!! Drives me NUTS.
.. They probably think you're riding like some hot-shot when all along, you're just cruising along. They must be pretty paranoid 
if they won't cross the speed limit as stated on their speedometers. 
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fiestman
Primary/Transmission/Driveline/Clutch
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Jun 9, 2007 07:07 PM
accuracy, check, cooper, davidson, devices, federal, gps, harley, inaccurate, mini, motorcycle, pulley, speedometer, standards, truck
