speedometer 5 mph off ?? rear tire?? - Kawasaki Vulcan Forum : Vulcan Forums
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post #1 of 21 (permalink) Old 07-14-2013, 04:30 PM Thread Starter
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speedometer 5 mph off ?? rear tire??

I just bought my 2012 vulcan classic lt. It was new left over stock. I have put about 700 miles on it now. I noticed when driving down the highway I get passed a lot. So I decide to take my handheld gps with me down the road. My speedo is off by about 5 mph. So 60 is 55, 70 is 65. I have read where people have put on bigger tires and different pulley to bring the rpms down on the highway. Would a bigger tire correct the speedometer some too?? If so what size are you guys using.
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post #2 of 21 (permalink) Old 07-14-2013, 04:55 PM
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Thats great, you'll never get a speeding ticket that way, i hope mine is doing that too!
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post #3 of 21 (permalink) Old 07-14-2013, 05:03 PM Thread Starter
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That is true will help with tickets. lol It also make me wonder about the odometer. If it saying I have more miles on it then I really do. I will have to check that some time
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post #4 of 21 (permalink) Old 07-14-2013, 05:28 PM
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That is true will help with tickets. lol It also make me wonder about the odometer. If it saying I have more miles on it then I really do. I will have to check that some time
That is correct - it does!

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post #5 of 21 (permalink) Old 07-14-2013, 05:34 PM
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The 9's speedo has been found to be as much as 10% optimistic, tho 6% seems to be the more common number.. Every one of them reads fast unless you overdrive with pulleys or go to a larger-diameter rear tire.

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post #6 of 21 (permalink) Old 07-14-2013, 05:41 PM Thread Starter
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How about the odometer?? Are those accurate?? I can live with the speedometer being off as long as the miles are correct. I understand that 5 mph really is not that much. But that would be an extra 50 miles for every 600 miles road.
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post #7 of 21 (permalink) Old 07-14-2013, 06:05 PM
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How about the odometer?? Are those accurate?? I can live with the speedometer being off as long as the miles are correct. I understand that 5 mph really is not that much. But that would be an extra 50 miles for every 600 miles road.
The odometer measures distance based on a calibration value for the rear tire diameter. Since that value is obviously not accurate, your odometer will be afflicted the same way the speedo is.

Every speedo has a margin of error, but bikes are bad in general and the 900 seems to be one of the worst offenders.

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post #8 of 21 (permalink) Old 07-14-2013, 06:53 PM
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Speedo Healer is an electronic gadget that allows you to correct the speedometer and odometer readings. Just google Speedo Healer for sellers.

I recently heard praise for the Speedo Healer from a GoodWing rider, who said it's available for cars and motorcycles.

But I know nothing about them,
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post #9 of 21 (permalink) Old 07-14-2013, 08:25 PM
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Here is a string of posts that answers some of your questions. https://www.vulcanforums.com/forums/s...hlight=dirtwiz

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post #10 of 21 (permalink) Old 07-14-2013, 09:13 PM Thread Starter
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Ok I have been reading some post on this. I think I am just getting confused now. Every one has an speedo that's off. K well some say their odometer is right some say they are off too. Some say they put on a 170/80r15 tire others 200/70r15 tire. Stock is 180/70r15. OK first what is the difference in tire 170 and 200??

A taller tire makes the speedo read slower?? so 55 could really be 60
A smaller tire makes speedo read faster?? so 70 could really be 60

Or one could change the pulley front, rear or both. Which will also change the speedo. But by changing either pulley makes the speedo read slower. so 50 could really be 70

Now how do these changes affect the odometer?? I understand any of these will change rpms and shift points.

Last edited by mes882; 07-14-2013 at 09:16 PM.
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