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Feeling some vibration through my seatpost when i spin my rear wheel

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Feeling some vibration through my seatpost when i spin my rear wheel

Old 01-03-21, 10:12 AM
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Ev0lutionz
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Feeling some vibration through my seatpost when i spin my rear wheel

I've just been through a really wet ride, with rain pouring. Does it mean water has entered my hub bearings or do I just need to service my freehub body?

The vibrations also can be felt through the crank.

I couldnt feel it while riding though, only felt it through my workstand.
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Old 01-03-21, 10:19 AM
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Who knows? No one can tell you exactly what's wrong via the interwebs. It's going to be one of the 2 things you posted but only you'll be able to figure it out. If it feels rough when both pedaling and coasting it's probably the hub, if it's only rough when coasting it's the freehub.
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Old 01-03-21, 10:41 AM
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Put the rear wheel off the ground. Pull the chain off the rear cogs. Spin the rear wheel, the cogs/freehub body will turn with the hub. Note the feel/sound. Then with the wheel still spinning place a hand on the cogs and stop their movement (or induce coasting). Again note the sound/feel. What this does is separate the hub/axle bearings from the freehub's. (or it does for many designs that have the freehub's bearings not bearing directly on the axle). If there's a change to the feel then the freehub bearings are suspect. If the feel remains the same (and is emitting the vibration both ways) then the axle bearings are the likely cause. Doing this experiment with the wheel secured on the bike maintains the bearings' preload, doing this with the wheel off the bike will reduce the axle bearings' preload and, thus, change the conditions from what are present when riding the bike.

BTW don't forget that the bike has other bearings that are also seeing the same water exposure. Just because you don't sense anything "wrong" with the other bearings doesn't mean they are impervious to water issues. All it means is that either you don't yet feel their condition, you don't have the "touch" to do so yet, or that they are still way down on the wear curve. Andy (who spoke to this on another thread just the other day)
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Old 01-03-21, 10:58 AM
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Have you also done the same spinning of the wheel before your water ride so you actually know what it felt like before? If not, it might just be normal stuff for your bike that's been going on all this time.
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Old 01-03-21, 11:11 AM
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Originally Posted by Ev0lutionz View Post
I've just been through a really wet ride, with rain pouring. Does it mean water has entered my hub bearings or do I just need to service my freehub body?

The vibrations also can be felt through the crank.

I couldnt feel it while riding though, only felt it through my workstand.
If you can't feel it as you ride it isn't a problem.
​​​​​​Oil the chain the freehub and bearings if possible. Do the cables ends as well.
The bearings will wear out eventually wether they get wet or not and when they do replace the wheel or the bearings.
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Old 01-03-21, 11:32 AM
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Do you know what type of bearings the hubs use? How long has it been/how many miles since the hubs have been serviced?
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Old 01-03-21, 12:25 PM
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It's tough to determine just how a hub bearing is doing with the wheel on the bike.
Take the wheel off the bike, hold the hub and spin the wheel.
Any vibration or drag in the bearings should be immediately obvious when hand held.

Barry
.
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Old 01-03-21, 04:07 PM
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Originally Posted by blamester View Post
If you can't feel it as you ride it isn't a problem.
​​​​​​Oil the chain the freehub and bearings if possible. Do the cables ends as well.
The bearings will wear out eventually wether they get wet or not and when they do replace the wheel or the bearings.
Sounds like the "head in sand" method.

One thing about his forum is that so many ask only after they notice a possible issue. One thing I have tried to get across so many times is the preventative approach. If you maintain the bike well you nip in the bud or completely avoid the need for down time due to the fix being done. Preventative work is easily scheduled to your riding needs. So when one wheel seems to be a concern don't hide your head in the sand and do nothing about the other wheel.

BTW water penetration into the bearings will seriously shorten their working life. Andy
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Old 01-03-21, 05:25 PM
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How about when you spin the front wheel? A wheel without any weight on it may give a bearing rattle/vibration (from the slight clearance) that's not apparent when weighted.
Best to remove the wheel and slowly turn the axle with your fingers, feeling for rough spots.
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Old 01-04-21, 04:49 AM
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Originally Posted by Andrew R Stewart View Post
Sounds like the "head in sand" method.

One thing about his forum is that so many ask only after they notice a possible issue. One thing I have tried to get across so many times is the preventative approach. If you maintain the bike well you nip in the bud or completely avoid the need for down time due to the fix being done. Preventative work is easily scheduled to your riding needs. So when one wheel seems to be a concern don't hide your head in the sand and do nothing about the other wheel.

BTW water penetration into the bearings will seriously shorten their working life. Andy
Fair enough but my point was if the damage is done it's too late. It's rumbly now weight off but not noticeable when you ride it. Bicycle hubs are simple things and this one will likely run for years just the way it is. It won't fail dramatically so ride it till it gets noticeable when you ride and then replace or repair.
Keeping ahead of maintenance is my policy but eventually things wear out anyway.
If he services it now will it really be any better.
if the bearings can be replaced why do it now.
He won't notice when he rides it anyway but if he spins the wheel by hand it will feel good.
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Old 01-04-21, 05:38 AM
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Originally Posted by Ev0lutionz View Post
I've just been through a really wet ride, with rain pouring. Does it mean water has entered my hub bearings or do I just need to service my freehub body?

The vibrations also can be felt through the crank.

I couldnt feel it while riding though, only felt it through my workstand.
I have the same experience with my freewheel but because a freewheel isn't sealed and exposed to the elements.

I simply let my bike dry and inject lube in the freewheel and the freewheel spins smoothly again. Are you really sure you have freehub, not a freewheel??

If the rough vibrations also occur when you turn the crank forward, then you also need to re-lube the chain. Strong rain can wash away some, if not most of the chain lube so chain may also need re-lube
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Old 01-04-21, 06:47 AM
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Ev0lutionz
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Originally Posted by blamester View Post
If you can't feel it as you ride it isn't a problem.
​​​​​​Oil the chain the freehub and bearings if possible. Do the cables ends as well.
The bearings will wear out eventually wether they get wet or not and when they do replace the wheel or the bearings.
Maybe its my placebo effect, but i'll monitor! I only feel the vibration/pulses when the bike is spinning freely without me on it.
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Old 01-06-21, 12:10 AM
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Patient: Doctor, everything vibrates when I do this!
Doctor: Don't do that.
Patient: Doctor, maybe it's the placebo effect.
Doctor: What? No.
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Old 01-06-21, 09:00 AM
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Originally Posted by Ev0lutionz View Post
Maybe its my placebo effect, but i'll monitor! I only feel the vibration/pulses when the bike is spinning freely without me on it.
Andrew R. Stewart gave you solid advice. Wishing it away is not going to solve anything.
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Old 01-06-21, 10:13 AM
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woodcraft
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Could be water in the rim.
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