RD/Cassette-Hub/Chain noise
09-03-13, 09:28 AM
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RD/Cassette-Hub/Chain noise
I've been experiencing an intermittent clunk on the rear mechanical that feels more like a "lazy" shift than the chain skipping. Yes, I can feel it on my pedals. New wheelset (BHS hub), 5k miles on the 5700 cassette (looks brand new), new KMC X10SL chain (old one was still measured OK after 3k miles), and 5700 rd adjusted by me obsessively. It all started on my second ride with the new wheelset climbing a small hill pulling a Chariot with my toddler inside. RD adjustment and new chain where done after this. I opened and inspected the hub and pawls look ok to me. Slightly lubed the surface of the freehub this time before re-installing cassette. Now it only does it in the flats while spinning without much effort and still intermittent. Will do it like 2-5 times per ride. (18-65 miles) I've also taken apart the rear housing and lubed it and it looks ok. Also, there's not really a gear combination that does it more than another one. Super frustrated here; thoughts?
09-04-13, 08:19 AM
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09-04-13, 08:31 AM
#5
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RD/Cassette-Hub/Chain noise
5000 miles on a ten speed cassette is enough wear to cause skipping with a new chain. If you are sure the chain is not skipping, and since it happens when you start pedaling after coasting, it sounds like a pawl that is failing to engage.
Does it sound like a sharp click accompanied by a vibration (but no significant jerk as in the case of a skipping chain) felt in the pedal?
Pawl mechanisms should be lubricated with a light oil.
I'm sure others will chime in shorty with other possible scenarios.
Does it sound like a sharp click accompanied by a vibration (but no significant jerk as in the case of a skipping chain) felt in the pedal?
Pawl mechanisms should be lubricated with a light oil.
I'm sure others will chime in shorty with other possible scenarios.
Last edited by Yan; 09-04-13 at 08:38 AM.
09-04-13, 09:06 AM
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5000 miles on a ten speed cassette is enough wear to cause skipping with a new chain. If you are sure the chain is not skipping, and since it happens when you start pedaling after coasting, it sounds like a pawl that is failing to engage. Only 5k miles seems low to me, but maybe it's that.
Does it sound like a sharp click accompanied by a vibration (but no significant jerk as in the case of a skipping chain) felt in the pedal? Kinda' like that. Definitely a sharp click accompanied by more than a vibration but not really what I'd think a skipping chain will feel like. Have you ever shifted but not far enough on the lever to actually complete the shift? That's what it feels like.
Pawl mechanisms should be lubricated with a light oil. I opened the hub and they seem to be fine, but I'm no mechanic/expert.
I'm sure others will chime in shorty with other possible scenarios.
Does it sound like a sharp click accompanied by a vibration (but no significant jerk as in the case of a skipping chain) felt in the pedal? Kinda' like that. Definitely a sharp click accompanied by more than a vibration but not really what I'd think a skipping chain will feel like. Have you ever shifted but not far enough on the lever to actually complete the shift? That's what it feels like.
Pawl mechanisms should be lubricated with a light oil. I opened the hub and they seem to be fine, but I'm no mechanic/expert.
I'm sure others will chime in shorty with other possible scenarios.
09-04-13, 09:31 AM
#7
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If the problem starting after the new wheelset, go back to the old wheelset and see if it disappears. If so, you have a bad freehub. The cassette seems to be very unlikely since you've described the problem as happening in any rear cog. It would be highly unlikely for your cassette to be worn that evenly but not impossible. Regardless, assuming you have a spare wheelset to try, doing that test will likely pinpoint the problem.
09-04-13, 10:11 AM
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If the problem starting after the new wheelset, go back to the old wheelset and see if it disappears. If so, you have a bad freehub. The cassette seems to be very unlikely since you've described the problem as happening in any rear cog. It would be highly unlikely for your cassette to be worn that evenly but not impossible. Regardless, assuming you have a spare wheelset to try, doing that test will likely pinpoint the problem.
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