Rubbing hizzing noise near bottom bracket
05-04-11, 05:28 PM
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Rubbing hissing noise near bottom bracket
Hello All,
I'm looking for a little bit of advice in troubleshooting an issue. I got a Trek5200 04' frame with Ultegra SL, Ksyrium wheels etc. Just recently when going down hill on semi rough roads I get some type of rubbing near the bottom bracket. The noise is like a hiss, but the vibration from some kind of rub travels up the seat tube. Noise and vibration goes away as I move the cranks forward. I've tried many times to see if the wheel is hitting something. I event did a complete overhaul of that entire section, remove BB, cranks, front derailleur, pedals, change cable, clean it up, and use grease when putting all screws back. I even check the area for cracks.
A mechanic did a quick check and didn't see anything. Reproducing the issue is difficult since I have to find a specific section that will allow the problem to occur. I was just wondering if anybody out there had experienced the same.
One thing I did due not too long ago was to cut my seat post, and one thing I haven't yet checked.
dmptman.
I'm looking for a little bit of advice in troubleshooting an issue. I got a Trek5200 04' frame with Ultegra SL, Ksyrium wheels etc. Just recently when going down hill on semi rough roads I get some type of rubbing near the bottom bracket. The noise is like a hiss, but the vibration from some kind of rub travels up the seat tube. Noise and vibration goes away as I move the cranks forward. I've tried many times to see if the wheel is hitting something. I event did a complete overhaul of that entire section, remove BB, cranks, front derailleur, pedals, change cable, clean it up, and use grease when putting all screws back. I even check the area for cracks.
A mechanic did a quick check and didn't see anything. Reproducing the issue is difficult since I have to find a specific section that will allow the problem to occur. I was just wondering if anybody out there had experienced the same.
One thing I did due not too long ago was to cut my seat post, and one thing I haven't yet checked.
dmptman.
06-02-11, 05:35 PM
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Might have the same deal going on
Hello All,
I'm looking for a little bit of advice in troubleshooting an issue. I got a Trek5200 04' frame with Ultegra SL, Ksyrium wheels etc. Just recently when going down hill on semi rough roads I get some type of rubbing near the bottom bracket. The noise is like a hiss, but the vibration from some kind of rub travels up the seat tube. Noise and vibration goes away as I move the cranks forward. I've tried many times to see if the wheel is hitting something. I event did a complete overhaul of that entire section, remove BB, cranks, front derailleur, pedals, change cable, clean it up, and use grease when putting all screws back. I even check the area for cracks.
A mechanic did a quick check and didn't see anything. Reproducing the issue is difficult since I have to find a specific section that will allow the problem to occur. I was just wondering if anybody out there had experienced the same.
One thing I did due not too long ago was to cut my seat post, and one thing I haven't yet checked.
dmptman.
I'm looking for a little bit of advice in troubleshooting an issue. I got a Trek5200 04' frame with Ultegra SL, Ksyrium wheels etc. Just recently when going down hill on semi rough roads I get some type of rubbing near the bottom bracket. The noise is like a hiss, but the vibration from some kind of rub travels up the seat tube. Noise and vibration goes away as I move the cranks forward. I've tried many times to see if the wheel is hitting something. I event did a complete overhaul of that entire section, remove BB, cranks, front derailleur, pedals, change cable, clean it up, and use grease when putting all screws back. I even check the area for cracks.
A mechanic did a quick check and didn't see anything. Reproducing the issue is difficult since I have to find a specific section that will allow the problem to occur. I was just wondering if anybody out there had experienced the same.
One thing I did due not too long ago was to cut my seat post, and one thing I haven't yet checked.
dmptman.
06-02-11, 08:24 PM
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Similar problem, I think, for my '05 Spec Roubaix w/ Mavic Ksyrium SL wheels. Weirdly, my loud/rubbing noise only appears after riding like 40+ miles & it's only while coasting. I start peddling & it goes away til I coast again. Seems like it has to be either the BB or the rear hub. LBS say the freehub looks good, but i'm not sure i buy that. BB is original so maybe the bearings are shot. Maybe god is saying its time for a new bike!!
06-06-11, 11:27 AM
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After checking every other option, I had no doubt that the noise was coming from the rear hub. After doing a Google search on Mavic free hub problems, I found RogueMechanic's YouTube videos. I followed step by step, removed the hub, cleaned all parts and seals from debris and gunk, and lube with suspension oil instead of mineral based oil (which is what I had available it’s almost the same as well as 5wt motor oil I believe) and the noise is now gone! I've put about another 100 miles after doing this and have not experienced the noise again!
One quick note of advice if anybody attempts to do this follow Rogue's suggestions, if the free hub inside nylon bushings are worn out then it's better to just replace. The free hub body will cost anywhere between $50-$80, which is better than spending another $200+ for a rear wheel. In my case the wheels are just about a year old, so the parts were not really worn out. The noise must have come from the debris that had build around the seals and inner nylon bushing of the hub.
One quick note of advice if anybody attempts to do this follow Rogue's suggestions, if the free hub inside nylon bushings are worn out then it's better to just replace. The free hub body will cost anywhere between $50-$80, which is better than spending another $200+ for a rear wheel. In my case the wheels are just about a year old, so the parts were not really worn out. The noise must have come from the debris that had build around the seals and inner nylon bushing of the hub.
