speedo accuracy - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 5 (permalink) Old 08-07-2017, 09:22 PM Thread Starter
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speedo accuracy

how accurate is the 750 speedo when bike has stock tires? Is it a constant amount or does it vary with speed?

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post #2 of 5 (permalink) Old 08-07-2017, 10:18 PM
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It will be off the same percentage of the actual speed at all speeds. Let's say it's off 10%. At 10 mph that's 1 mph error. At 30 it's 3, at 60 it would be 6.

The absolute error number increases with speed, but the percentage is the same
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post #3 of 5 (permalink) Old 08-08-2017, 12:24 AM
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I concur. Owned two VN750s and the speedometer is off right about 10% to true speed with stock-sized tires.
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post #4 of 5 (permalink) Old 08-08-2017, 06:50 PM
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My GPS tells me that an indicated 70 mph is actually 64 mph. Stock sized tires.
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post #5 of 5 (permalink) Old 02-09-2018, 01:43 AM
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Yep, 8-10 depending on brand of tires. The same size in one brand will be a slightly different measurement on another. In fact, I "sized up" my rear once to another brand and found it was smaller in rolling diameter. Anyway, I've run a bunch on 5 or 6 vn750s ranging from 86 to 06. Usually closer to 10%, checked by radar, GPS, etc.

If you want to be reeeeeally anal, it'll be slightly less than a linear 10% because as the bike goes faster, the rear tire can stretch vertically from centrifugal force

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