Can Someone Explain Runout? - GL1800Riders
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post #1 of 16 (permalink) Old 06-15-2017, 04:58 AM Thread Starter
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Can Someone Explain Runout?

Can someone help me understand the difference between axial vs radial vs lateral runout on a wheel. I know what lateral is and thought I knew what radial is but am confused about the difference between axial and radial if there is any. Thanks in advance for your help!

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post #2 of 16 (permalink) Old 06-15-2017, 05:53 AM
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https://en.wikipedia.org/wiki/Tire_uniformity

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post #3 of 16 (permalink) Old 06-15-2017, 11:32 AM
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I don't think axial is really a tire measurement. The tire run out that I am familiar with is measured in lateral or radial.


By definition, radial is measured at the end of the radius (outside of the tire) to make sure the tire is perfectly round. Not really applicable to tires but my assumption is that axial is measured at the center of the axle to make sure that the point the tire is rotating around isn't the source of any radial run out issues. (consider a worn out axle or bearings with 2MM of slop....that 2MM will make it's way to the edge of the tire and would be the source of 2MM of Radial run out...but it wouldn't be because the tire was out of round.

Adding to the above concept, I suppose you could measure a kind of axial run out by measuring the run out at the rim (which would also be the bead of the tire) So...if you had a rim with 2MM of run out, it's likely that the run out high point of the tire would correspond to the high point on the rim. I would expect the tire would minimize the rim's run out though so 2MM at the rim would probably be less than that at the radius (outside edge of the tire)


Bottom line....if measuring....just start with radial. If it's within tolerance, you should be fine. If it's out, then you might pay attention to the axle or rim to make sure their run out isn't causing the radial run out to be out of spec.
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post #4 of 16 (permalink) Old 06-15-2017, 11:42 AM
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Quote:
Originally Posted by Johnny S View Post
Can someone help me understand the difference between axial vs radial vs lateral runout on a wheel. I know what lateral is and thought I knew what radial is but am confused about the difference between axial and radial if there is any. Thanks in advance for your help!

Johnny S
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post #5 of 16 (permalink) Old 06-15-2017, 12:17 PM Thread Starter
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Thanks everyone. My reason for asking is the Factory Service Manual states wheel specs in terms of radial and axial runout and I've never been exactly sure what that meant. I'm more familiar with the lateral (side to side) and thought radial meant pretty much the same thing as what you explained, Dave. Axial still remains somewhat a mystery to me.

J S
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post #6 of 16 (permalink) Old 06-15-2017, 07:53 PM
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post #7 of 16 (permalink) Old 06-16-2017, 01:37 PM
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post #8 of 16 (permalink) Old 06-17-2017, 01:26 PM
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Radial run out is the side to side variation in the wheel rim as you turn it about it's axis (axle).
with a dial caliper it should track within about .020". Any greater than that amount and the tire will try to "walk" side to side giving faster tire wear and any vibration in handles bars or rear end depending on which wheel we are talking about.
Axial run out is the movement parallel to the axis (axel). Side to side movement of the wheel on the axel.


Hope this helps.
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post #9 of 16 (permalink) Old 06-17-2017, 01:40 PM
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post #10 of 16 (permalink) Old 06-18-2017, 05:13 AM
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