Speedometer accuracy - K-Bikes.com - Excellence in Motion
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post #1 of 22 (permalink) Old Sep 22nd, 2008, 8:52 pm Thread Starter
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Speedometer accuracy

While riding with cruise control at 80mph, I reset my BC avg.mph and the BC claimed 76.7 mph. Doing the same at 60mph claimed 58.1mph. Sorry I don't use a nav, any other input or ideas on speedo accuracy?
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post #2 of 22 (permalink) Old Sep 22nd, 2008, 8:57 pm
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My GPS is way more accurate than the analog speedometer on the bike, which always seems to be off by roughly 4 or 5% so why should the digital bike computer be any different! You could always measure a mile @ 60 with a watch.

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post #3 of 22 (permalink) Old Sep 22nd, 2008, 8:59 pm
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BMW is notorious for setting the speedo 3-5 MPH higher that the real bike speed. Just figure your going 4 MPH less than the speedo is reading.

If an officer of the law does stop you for going 4 miles faster than the speed limit just show them a copy of this post and they will not give you a citation for speeding.

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post #4 of 22 (permalink) Old Sep 22nd, 2008, 9:15 pm
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I find my avg speed indicator on the BC is dead on with my Nav 3. The indicated speed is about 5 kph faster than actual ( the same is true with my 535i - I was told about this by a tech ~ 15 years ago)
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post #5 of 22 (permalink) Old Sep 22nd, 2008, 9:52 pm
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If you're doing 150mph, does it really matter?

What was that middle thang?
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post #6 of 22 (permalink) Old Sep 22nd, 2008, 10:54 pm
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My gps tells me that the speedo is off by 3 or 4%. At 70 mph on the speedo, gps says 66. at 120 on speedo, gps says 114. I haven't checked it out higher than this yet! I have to find a road to do it on and there are no roads in my area.

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post #7 of 22 (permalink) Old Sep 23rd, 2008, 4:52 am
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Larry, must be hard to ride with no roads in your area!!

A couple of weeks ago I had my cruise control set to 100kph and the policeman that pulled me up for doing 101 in an 80 zone said that my speedo must have been pretty accurate.

The stupid thing was that I had it set to the speed limit so that I wouldn't get a speeding fine and lose demerit points. However, the cruise control didn't know that the speed limit reduces to 80 for a couple of hundred metres leading up to traffic lights. The cops hiding behind the trees with a radar gun did though.


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post #8 of 22 (permalink) Old Sep 23rd, 2008, 8:11 am
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Funny you start this thread, I was just going to do the same. Not that I've got the GPS up and running (Zumo 450) I see my speed is off about 2mph at 60 and 4mph at 130. 3.3% percent for me and it's linear from 30mph to moderated.
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post #9 of 22 (permalink) Old Sep 23rd, 2008, 9:16 am
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The speedo is off a fairly consistent 3-3.5 MPh across the range. This is a vast improvement to the 8-10% off that earlier BMW speedos exhibited.

David Taylor
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post #10 of 22 (permalink) Old Sep 24th, 2008, 1:43 pm
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about +5 km/h here

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