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post #1 of 14 (permalink) Old 10-10-2011, 11:15 AM Thread Starter
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Speedometer/Odometer

Can anyone explain the controversy regarding speedometer and odometer calculations? I have read that on the VN750 these are not accurate and others claim that with all the positive engineering they have to be correct. I am at a loss and would like to know if a stock meter is reading high or low. I appreciate any true insight here as always.

Tom
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post #2 of 14 (permalink) Old 10-10-2011, 11:31 AM
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With stock front tire...speedo reads high, odo is accurate.

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post #3 of 14 (permalink) Old 10-10-2011, 12:26 PM
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Quote:
Originally Posted by Knifemaker View Post
With stock front tire...speedo reads high, odo is accurate.
KM`s opinion seems to be the general consensus here.
I have not tested the speedo and odometers accuracy myself, but received this PM from another member who has obtained different results. I don`t have a GPS to check against, so I offer the following observation for you to consider:

Quote:
I respect KM and others opinion about the speedometer/odometer thing, but disagree. My experience has been different. Prior to the tire change I consistently indicated more miles on the odometer than actually driven. For every 12 miles indicated, I was actually driving 11. Now, based on GPS, it's dead on. This is also supported using highway mile markers. Just MHO. (Hmmm, now I wonder if those posts/threads were pre-GPS days??)

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post #4 of 14 (permalink) Old 10-10-2011, 12:41 PM
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I haven't checked the odometer, but, with a stock front tire, my speedometer is ~10% faster than actual. I've accurately (measuring wheel) marked out a 1 mi stretch of road and used a stopwatch to check my time at various speeds to reach this conclusion. Because of the dials on the odometer, it's just not accurate enough to check that. You'd need a longer run of verified distance where a tenth or so comes out in your error.

FWIW: Instant speed, or whatever your GPS calls it, can fluctuate quite a bit. Some units include an automatic 'averaging' in this speed (i.e. average distance traveled between 'fixes' for last 5 readings). If your unit doesn't do this, you should look at what the unit calls 'average speed', but be aware stops are often factored into this unless you reset while traveling at speed.
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post #5 of 14 (permalink) Old 10-10-2011, 12:57 PM
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Sorry, it's not "opinion" but provable fact. With a stock tire the odometer is accurate. (as accurate as one can measure )

The above PM I read as with an unknown tire with appearently much wear, the odo was reading high..... But a new tire seemed to be spot on.

I bought my bike new, so it had new stock tires. 120 miles of highway mile markers showed 120 miles on the odometer. If you are running different than stock tires, or if the tire is very worn , these numbers might not match.... Duh...

There alot of folks running the 110 front. This will make the speedometer reading more accurate.... But likely will alter the odo reading.

In the scheme of things.... I list this under the heading of
"who FKing cares?" ....

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Last edited by Knifemaker; 10-10-2011 at 01:01 PM.
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post #6 of 14 (permalink) Old 10-10-2011, 01:26 PM
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What I've gotten with a stock-size S11F based on time and reported mileage between east/west section line roads calculated out to 10% fast on the speedometer and 1.7% overreporting on the odometer. YMMV.

The 100/90-19 has a theoretical diameter of 2* (90% of 100 mm) + 19 inches = 26.09 inches and the 110/90-19 has a theoretical diameter of 2* (90% of 110 mm) + 19 inches = 26.80, 2.7% more.

Based on this, I would expect the speedometer to read 7% fast and the odometer to under-report by 1% with a 110, but this involves a lot of assumptions, starting with the assumption that the tires are exactly the size their specifications would imply. Tread wear would also a factor.
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post #7 of 14 (permalink) Old 10-10-2011, 02:17 PM
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Maybe I'm lucky but I've got the 100 cruz up front and my speedo is within 1-2 mph of GPS and various police speed alert units they've put in towns around here. Never tested the odo but I'm really not concerned too much with that.

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post #8 of 14 (permalink) Old 10-10-2011, 05:32 PM Thread Starter
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Thanks for all the many and different responses. Now I have my real answer, if there is any difference it is very minor and of no real concern. Sorry to have stirred up a hornet's nest. If I knew before hand this would be the result I would have added in a second question about motor oil lol

Tom
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post #9 of 14 (permalink) Old 10-10-2011, 06:05 PM
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Whatever you do, don't ask how to turn the bike off...
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post #10 of 14 (permalink) Old 10-10-2011, 07:02 PM Thread Starter
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Quote:
Originally Posted by IMBoring25 View Post
Whatever you do, don't ask how to turn the bike off...
I won't but I was thinking about asking what side different riders climb on or off of their bikes. That should get things going.

"Ride till you rot!"

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