Wheel Run Out Tolerances

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Headcoats
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Wheel Run Out Tolerances

#1 Post by Headcoats » Wed Feb 06, 2019 3:16 pm

My LC manual says 2.00mm maximum run out tolerance but my Triumph Bonneville 2002 manual says maximum is only 0.6mm !

So for motorcycle wheels in general what is the average tolerance ?
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MK
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Re: Wheel Run Out Tolerances

#2 Post by MK » Thu Feb 07, 2019 8:00 am

Depends a bit on the vehicles top speed.
The forces caused by a rotating unbalanced mass are rising with the second power of speed. (=> double speed = four times the force than before).

That said, you can easily determine on your own that a 2mm runuout is harmless if you only ride around town or live in one of those shithole countries having a general speed limit.
Using the same value on a 200 mph bike may cause severe vibration.
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Martin

Headcoats
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Re: Wheel Run Out Tolerances

#3 Post by Headcoats » Thu Feb 07, 2019 9:55 am

Well the wheels are for the 350 LC Hybrid I'm hoping to finish this year
My riding is mostly 50 to 80 mph and the odd blasts 90 to 100mph :smt001

I know I only have the Triumph and LC manuals to go on and both have similar top speeds , but 0.6mm to 2.00mm is quite a variation ?
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Re: Wheel Run Out Tolerances

#4 Post by MK » Thu Feb 07, 2019 12:57 pm

The Yamaha 350YPVS workshop manual states 1mm in radial and 0.5mm in axial direction.
That seems sensible to me for an LC, too.
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Martin

brrrappp
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Re: Wheel Run Out Tolerances

#5 Post by brrrappp » Thu Feb 07, 2019 3:57 pm

MK is absolutely correct: It is very Speed-dependent. Less than 80 mph and you can sometimes go without even balancing the tires!

Not that I'm an expert on the subject but it would seem to me that if you are less than 2mm on rim run-out, your tire would to have a greater impact than your rim.
In other words, the tire is just as likely to have imperfections or balance issues that are amplified due to the rotating mass being further from the axle.

There is another thing to be mindful of and that is called "stacking of tolerances."
If you are at or toward the outside tolerance on more than one steering and handling tolerance you may induce poor performance, wiggle, hop, shimmy etc.
Example: Rotors that are near the limit on run-out plus fork wear near the limit + slightly low tire psi and or slight tire imbalance can cause a severe hop or wiggle. Just as normal tire wear plus + old fork oil or low fork pre-load causes deceleration shimmy. All within tolerance with awful results.

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Smoker
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Re: Wheel Run Out Tolerances

#6 Post by Smoker » Thu Feb 07, 2019 6:28 pm

Quite a variation in the years that the bikes were built. :smt003

Comparing a modern bike to an antique bike, I would expect the tolerances to be just as you describe.

What's the actual run-out on your LC wheels?

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Re: Wheel Run Out Tolerances

#7 Post by Headcoats » Fri Feb 08, 2019 12:24 pm

Just to confuse matters even more , the wheels I'm using are Kawasaki KR1S wheels circa 1992
I'm getting a 2mm side to side shimmy

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