extra noises in freehub
05-05-15, 07:09 PM
#1
Senior Member
Thread Starter
extra noises in freehub
I am overhauling a 1990s Trek 970. It is on the stand and when the rear wheel is spinning but the pedals are not turning (inotherwords, coasting on the stand) there is an extra rhythmic clicking noise, much less frequent and much, much louder the the typical freehub click. It sounded like it was coming from the hub.
I took off the wheel, took the cassette, axle, etc. off. I spun the wheel in my hand, holding the freehub. I thought I could feel the extra click or bump, but wasn't entirely sure. I took off the freehub and cleaned it as per Park Tool instructions. I oiled it and put it back on the wheel. I cleaned, lubed and installed everything else. Put the wheel back on and it still has the same extra click.
Ideas? Do I need a new freehub body? Is there any chance it could be the cassette? I don't have a spare but I could hunt one down. I would note that the cassette was tough to remove (not the lockring, the cassette body) and I had to give it a tap from the backside. There also were little gouges in the freehub body.
I took off the wheel, took the cassette, axle, etc. off. I spun the wheel in my hand, holding the freehub. I thought I could feel the extra click or bump, but wasn't entirely sure. I took off the freehub and cleaned it as per Park Tool instructions. I oiled it and put it back on the wheel. I cleaned, lubed and installed everything else. Put the wheel back on and it still has the same extra click.
Ideas? Do I need a new freehub body? Is there any chance it could be the cassette? I don't have a spare but I could hunt one down. I would note that the cassette was tough to remove (not the lockring, the cassette body) and I had to give it a tap from the backside. There also were little gouges in the freehub body.
05-05-15, 08:10 PM
#2
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OK, quick, easy diagnostic.
Remove the cassette, and/or install the wheel bypassing the chain, close the QR and spin the wheel. Do you hear it?
If so, it's the hub bearings (or related).
If not, put your finger against the freehub body and stop it while the wheel keeps spinning. Hear it now? If so, it's inside the freehub itself.
You can remove it, do a solvent soak and flush, set it on end to drain, then relube with a decent, sticky oil (not grease). Mount it, mount the axle, grease and adjusting the bearings and see if it's gone.
Or, once you've isolated it to the freehub, simply ignore it until here's a problem.
Remove the cassette, and/or install the wheel bypassing the chain, close the QR and spin the wheel. Do you hear it?
If so, it's the hub bearings (or related).
If not, put your finger against the freehub body and stop it while the wheel keeps spinning. Hear it now? If so, it's inside the freehub itself.
You can remove it, do a solvent soak and flush, set it on end to drain, then relube with a decent, sticky oil (not grease). Mount it, mount the axle, grease and adjusting the bearings and see if it's gone.
Or, once you've isolated it to the freehub, simply ignore it until here's a problem.
__________________
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
Last edited by FBinNY; 05-05-15 at 08:13 PM.
05-05-15, 08:57 PM
#3
Senior Member
Thread Starter
OK, quick, easy diagnostic.
Remove the cassette, and/or install the wheel bypassing the chain, close the QR and spin the wheel. Do you hear it?
If so, it's the hub bearings (or related).
If not, put your finger against the freehub body and stop it while the wheel keeps spinning. Hear it now? If so, it's inside the freehub itself.
You can remove it, do a solvent soak and flush, set it on end to drain, then relube with a decent, sticky oil (not grease). Mount it, mount the axle, grease and adjusting the bearings and see if it's gone.
Or, once you've isolated it to the freehub, simply ignore it until here's a problem.
Remove the cassette, and/or install the wheel bypassing the chain, close the QR and spin the wheel. Do you hear it?
If so, it's the hub bearings (or related).
If not, put your finger against the freehub body and stop it while the wheel keeps spinning. Hear it now? If so, it's inside the freehub itself.
You can remove it, do a solvent soak and flush, set it on end to drain, then relube with a decent, sticky oil (not grease). Mount it, mount the axle, grease and adjusting the bearings and see if it's gone.
Or, once you've isolated it to the freehub, simply ignore it until here's a problem.
Previously I took the freehub body off, soaked, flushed, and oiled. It made no difference. So ignore? I assume it isn't a safety issue, just an irritation issue.
05-05-15, 09:10 PM
#4
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Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 38,725
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Mentioned: 140 Post(s)
Tagged: 1 Thread(s)
Quoted: 5791 Post(s)
Liked 2,581 Times
in
1,431 Posts
Yes, ignore it unless you want to replace the freehub on suspicion alone. Often these are the result of uneven distribution of lubricant in the ratchet ring or elsewhere, or maybe a tiny piece of metal chip that didn't flush. It might not matter at all, or one day the freehub will fail (slip or more rarely lockup) and you can put butter and jam on it.
__________________
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
05-06-15, 02:39 PM
#5
Senior Member
Thread Starter
Thanks FB! I'll see if it drives the spouse crazy or if he can live with the click.
