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#1020625 - 10/10/18 05:07 PM Re: Odometer Error [Re: KSB]  
Joined: Sep 2014
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reg26 Offline
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reg26  Offline
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Joined: Sep 2014
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LI,NY
I have a NAV VI installed on my 2015 RT. In my experience , every motorcycle I have owned has had a Garmin GPS unit installed on it. On my all my bikes with GPS I always set cruise to the speed that is displayed on the GPS and ignored the speed displayed on the speedometer . I have never gotten a speeding ticket. I have found that MOST bikes display on the spedo about 2-3/12 MPH higher that actual speed according to the GPS . My KLR 650 was the worst ( 5mph over ) and my RT was in-line with most other bikes I have owned / own.( Yamaha , Harley, Harley, Harley LOL and Honda) ) I regularly cruise past the police at 66 mph on 55 MPH zones and at 72 in 65 MPH zones and have not gotten a ticket ever. My friends always slow down when an officer is present and I just keep on going at my speed never to receive a ticket. I do remember reading an article in Ryder Mag about how most moto spedos are off by 2-3 MPH. in favor of the slower speed


2015 R1200RT
2013 KLR 650
#1020684 - 10/11/18 12:00 PM Re: Odometer Error [Re: KSB]  
Joined: Oct 2005
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Pickaxe Offline
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Pickaxe  Offline
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Worcestershire, England
Having spent many years riding motorcycles with calibrated speedometers in addition to a GPS device, I can confirm that apart from a bit of lag during acceleration/deceleration, GPS devices are perfectly accurate.

#1020687 - 10/11/18 12:42 PM Re: Odometer Error [Re: KSB]  
Joined: Dec 2013
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bdfbeemer Offline
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Greensboro, NC
I have owned three BMWs. All have read greater than the gps. At 70 it is 2-3mph difference. I find when I follow cars they will consistently be doing 53 mph indicated on the gps. They may think they are going 55. Drives me nuits lol. I haven't routinely checked the miles on the bike odometer vs the gps. I did notice doing a SS 1000 that there was a difference between the bike and the gps. I can't remember the discrepancy. I think the gps showed more mile than the bike.

#1020710 - 10/11/18 05:21 PM Re: Odometer Error [Re: KSB]  
Joined: May 2007
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TestPilot Offline
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TestPilot  Offline
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Williamsville, NY
European regulations require speedometer testing at 40, 80 and 120 kph. Accuracy requirements for motorcycles are a) the speedometer must never read less than the actual speed and b) the maximum amount the speedometer can read above the actual speed is 10% of the test speed plus 8 kph. So at a test speed of 80 kph the speedometer could read as much as 92 kph and still comply with the regulation.


Karl
2007 R1200ST
#1020720 - 10/11/18 08:54 PM Re: Odometer Error [Re: TestPilot]  
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T-88 Offline
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Alberta
Originally Posted by TestPilot
European regulations require speedometer testing at 40, 80 and 120 kph. Accuracy requirements for motorcycles are a) the speedometer must never read less than the actual speed and b) the maximum amount the speedometer can read above the actual speed is 10% of the test speed plus 8 kph. So at a test speed of 80 kph the speedometer could read as much as 92 kph and still comply with the regulation.


Your math is different than mine.

A test speed of (80 kph + 10-percent = 88 kph) + (8 kph) = 96 kph. But you knew that. smile

What I find more interesting is that a test speed of 80 kph and an indicated speed of 96 kph yields an error of 20.0-percent, which is huge.

Tim

#1020728 - 10/11/18 11:58 PM Re: Odometer Error [Re: TestPilot]  
Joined: Aug 2016
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LittleBriar Offline
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Tip of Michigan's Thumb
Originally Posted by TestPilot
European regulations require speedometer testing at 40, 80 and 120 kph. Accuracy requirements for motorcycles are a) the speedometer must never read less than the actual speed and b) the maximum amount the speedometer can read above the actual speed is 10% of the test speed plus 8 kph. So at a test speed of 80 kph the speedometer could read as much as 92 kph and still comply with the regulation.

My BMW cars have always read high too. The regulations favor the engineers to intentionally set the speeds to be slightly higher than actual since they can get fined if they read less than actual.


Steve
'16 R1200RT
#1020914 - 10/15/18 06:54 AM Re: Odometer Error [Re: T-88]  
Joined: Feb 2001
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John Bentall Offline
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John Bentall  Offline
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London, England
Originally Posted by T-88
Originally Posted by TestPilot
European regulations require speedometer testing at 40, 80 and 120 kph. Accuracy requirements for motorcycles are a) the speedometer must never read less than the actual speed and b) the maximum amount the speedometer can read above the actual speed is 10% of the test speed plus 8 kph. So at a test speed of 80 kph the speedometer could read as much as 92 kph and still comply with the regulation.


Your math is different than mine.

A test speed of (80 kph + 10-percent = 88 kph) + (8 kph) = 96 kph. But you knew that. smile

What I find more interesting is that a test speed of 80 kph and an indicated speed of 96 kph yields an error of 20.0-percent, which is huge.

Tim


Tim, you are absolutely right...

.... and the error would be 26% at the the common urban speed limit of 50 kph.

What do you think would happen to sales if a manufacturer ever released a motorcycle with that sort of error? A fellow trying to observe the speed limit would be overtaken by all his buddies on bikes with accurate speedometers.


R1200RT LE - Ebony
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