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Problem with new wheel?

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Old 04-14-16, 02:47 AM
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jmenorton89
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Problem with new wheel?

Hi All,

i've just bought a new wheel-set for my upcoming tour, I think something may be wrong with the hub, there seems to be a bit of wobble and a strange rumbling noise, here's a couple of videos to try and show the issue, about 30secs in the camera focuses on the cassette which seems to be wobbling, all noise is from the hub, no brake rub at all, anyone got any ideas?


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Old 04-14-16, 03:40 AM
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dabac
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The way (many) hubs are manufactured means that the (virtual) axle that the cassette turns round isn't exactly aligned with the wheel axle. This is almost always a cosmetic issue only, and doesn't influence function in any noticeable way.
Remember that a cassette does it's work when stationary to the hub. A little play and wobble when coasting doesn't matter. But it should turn smoothly, apart from the pawl clatter.
Axles should also turn smoothly, with no, or very little play when twirled between your fingers.
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Old 04-14-16, 07:03 AM
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Andrew R Stewart 
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Agree with dabac about cog orbital action. This is not as bad as some I've seen.

As to the noise do some basic probing. Pull the chain off the cassette and spin the wheel. Is the noise still there? Pull the brake caliper off it's mount and spin the wheel. Is the noise still there? The noise that I true wonder about is the clatter during your spinning up the wheel in vid 2. Sure sounds like a lot of bad chain rub or tooth meshing. Like you're cross chaining or the rear der limit screw is way off. Andy.
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Old 04-14-16, 07:58 AM
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jmenorton89
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Originally Posted by Andrew R Stewart View Post
Agree with dabac about cog orbital action. This is not as bad as some I've seen.

As to the noise do some basic probing. Pull the chain off the cassette and spin the wheel. Is the noise still there? Pull the brake caliper off it's mount and spin the wheel. Is the noise still there? The noise that I true wonder about is the clatter during your spinning up the wheel in vid 2. Sure sounds like a lot of bad chain rub or tooth meshing. Like you're cross chaining or the rear der limit screw is way off. Andy.
All the noise while spinning up the wheel is caused by the bike stand in the second video, there's likely some chain rub in the first video, as its using a different cassette (as a test) and i didn't bother adjusting the derailer. Also all noise while freewheeling is just the hub, i loosened off the disk pads so there's no rub, and ensureed the wheel is not rubbing the mudguard.
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Old 04-14-16, 10:05 AM
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Originally Posted by jmenorton89 View Post
All the noise while spinning up the wheel is caused by the bike stand in the second video, there's likely some chain rub in the first video, as its using a different cassette (as a test) and i didn't bother adjusting the derailer. Also all noise while freewheeling is just the hub, i loosened off the disk pads so there's no rub, and ensureed the wheel is not rubbing the mudguard.

Wheel hubs are simple. If it's not rubbing something (brakes/mudguard) and it's not something else vibrating... (mudguard, reflector), then take a look at the hubs. Often times new shimano hubs are built FAR too tightly. Does the axle turn freely when not on the bike? Rebuild the hub if you think it's a problem.
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Old 04-14-16, 10:22 AM
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I' d take it out of the bike & check it separately in my Truing stand. to see if it is just the wheel problem.

& not take a video , but I'm ann old Guy from an era when we could work on our own cars too.


Freewheels had more planar wobble , than cassettes do on Freehubs.

Last edited by fietsbob; 04-14-16 at 10:26 AM.
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