Author Topic: How much out of round is out of round?  (Read 344 times)

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Offline RoadKillHeaven

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How much out of round is out of round?
« on: October 03, 2018, 03:23:02 am »
Further diagnosing handlebars wobble, I rigged up a simple test. With front end off the ground, I cleaned up the tire threads. Situated a floor stand as close as possible to the tire threads. Spun the wheel.. And to my surprise there is out of round condition.
Yes, the bead is seated all the way around the rim. Rim is as true as it can be.

What say you?



Cheers...

« Last Edit: October 03, 2018, 07:16:18 am by RoadKillHeaven »

Offline works4me

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Re: How much out of round is out of round?
« Reply #1 on: October 03, 2018, 10:59:59 am »
I’d say that’s out of round.
Enough that I’d be concerned.
Any chance of replacement under warranty?

Offline MAN OF BLUES

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Re: How much out of round is out of round?
« Reply #2 on: October 03, 2018, 10:30:35 pm »
imho, that doesn't look bad enough to warrant being called 'out of round',
yes, there is a bit of a 'gap', but it's like 1mm or so as the vid appears..
A tire with a bit off balance condition, that is 'perfect' (i.e., absolutly perfect), will end up like that within 500-1000 miles, or even worse... just a small balance amount will wear it like that.
Consider this... if the roads you ride on were smooth as a flat granite table, polished and true, you may 'feel it', but as roads go, the variations in the road surface are 10x greater than what that tire is showing.. the tire soaks those imperfections up without a question, by the 'sag' in the suspension, and 500-1000# of force during maneuvers, and braking...

I don't think that is where you 'wobble' is coming from... personally.

now, check the runout of the sidewall of the tire, on both sides, where the tread meets the sidewall, do both sides simultaniously, using a couple pieces of coathanger wire, and some 2x4 supports to 'create' an indicator probe... but it may shock you when you see the thing may be side to side up to 3mm of oscillation on some tires 'molded' dimensions when spun.


I spin and inspect every tire I mount, when I'm balancing them, using my balancer and taped on 'probes' made from a piece of wire, both radially, and side to side... I've seen much worse looking gaps run fine, without any "negative feeling feedback' thruout the life of those tires.

30 YEARS OF KAW.....Rich R. (the other one..)  COG 5977  JUSTAMEMBAHNOW
and if you are gonna call me names... it's MR. Analdweeb if you please...

Offline RoadKillHeaven

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Re: How much out of round is out of round?
« Reply #3 on: October 04, 2018, 12:10:35 am »
I understand.
It seems small, but on a heavy bike with very light steering (less rake) it has immediate effect. My previous tire, according to my memory, had virtually zero run-out. Even at the end of its life, there wasn't a hint of wobble. It was very smooth. This new front tire feels rough at speed. I am very sensitive to vibrations.
Everyone at work ask my help when it come to diagnosing drive-line vibes. I have yet to misdiagnose a bad vibe on a vehicle.
This front tire roughness bring back memories when my Sv1K developed roughness at the back. I spent fair amount of time looking at the tire, making sure it was properly aligned with the front etc.
It turned out to be worn out chain. Although it was still within specs, it had enough slack to cause shudder under throttle (decell or accel)
I'll rig up a thingamajig you've mentioned to check entire thread of the tire for axial run-out.
Cheers...
P.S my new balancer shows perfect static balance of new tire.

Offline MAN OF BLUES

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Re: How much out of round is out of round?
« Reply #4 on: October 04, 2018, 12:17:12 am »
 :great: :great:

30 YEARS OF KAW.....Rich R. (the other one..)  COG 5977  JUSTAMEMBAHNOW
and if you are gonna call me names... it's MR. Analdweeb if you please...

Offline RoadKillHeaven

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Re: How much out of round is out of round?
« Reply #5 on: October 04, 2018, 12:49:08 am »
These people from Western Power Sports are absolutely AWESOME.
Rep I've contacted is ready to ship new tire upon a proof of destruction of the old.

Cheers...

Offline RWulf

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Re: How much out of round is out of round?
« Reply #6 on: October 04, 2018, 02:02:26 pm »
Stop and think about how fast the tire is rotating. That would be
related to the vibration you think is coming from the tire. I don't
think it's coming from that tire.

Offline RoadKillHeaven

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Re: How much out of round is out of round?
« Reply #7 on: October 04, 2018, 02:53:41 pm »
We shall see after a replacement tire comes.

For comparison purposes I'll record a test on rear tire, which I initially thought was the culprit, an post.

Cheers...