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Grinding in the rear hub of my bike

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Grinding in the rear hub of my bike

Old 10-26-16, 07:26 PM
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Grinding in the rear hub of my bike

HI, I'm experiencing some trouble with a grinding noise coming from the rear wheel of my bike. I suspect the noise could be worn bearings or an untrue wheel but I was just wondering how to fix it and what it is. Thanks.
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Old 10-26-16, 07:47 PM
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I assume you cleaned and lubed your chain and the noise didn't lessen any? I doubt its an untrue wheel since that would not cause a noise unless it's hitting the brake pads which you should easily tell that.

Does the bike have a spoke guard? if so check to make sure it's not rubbing the largest gear.

Does the noise happen freewheeling and not back pedaling? if so then it's not the hub but the freehub will need to be replaced, or you could try removing it and soaking it in solvent for an hour, let it drain and then dry for 48 hours, then regrease it and see if that eliminates it.

If it grinds when pedaling forward then it's the hub, it could be something as simple as replacing the sealed bearing cartridge which usually that's the case, otherwise you may need a new hub which I highly doubt.

By the way all the repairs I mentioned can be viewed on You Tube if you want to tackle any of things yourself
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Old 10-26-16, 10:27 PM
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The only reliable way I've found to check a hub without disassembly is to remove the wheel and twirl the axle between the fingers (not the quick release skewer). If it feels like a pepper grinder or has uneven resistance it probably needs servicing.

Just spinning the wheel mounted on the bike has too much momentum and will overcome any slight resistance from worn or pitted surfaces. There may not be any discernible sound.

Two months ago I bought a new-to-me 25 year old bike. I checked almost everything for gross wear but neglected to properly check the hubs. I spun the wheels while they were mounted on the bike, but didn't remove the wheels to check the axles. However a month later when I replaced the tires I did spin the hub axles. I felt some resistance and unevenness, but nothing too alarming. With the wheels mounted the momentum of the tire weight overcame any slight resistance, and there was no grinding noise. However it got worse quickly. I disassembled both hubs this week and found both pairs of cones on both hubs need to be replaced -- the pitting caused that distinctive pepper grinder feel of uneven resistance.
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