Drivetrain Noise
11-17-19, 04:56 PM
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Drivetrain Noise
does anyone know what this noise is?
sounds like chain stretching or something. chain is not ready to be replaced.
https://youtu.be/OOkHZmW2ht4
sounds like chain stretching or something. chain is not ready to be replaced.
https://youtu.be/OOkHZmW2ht4
11-17-19, 05:10 PM
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Hard to diagnose with that video. Is the front derailleur rubbing the chain ? That's my first guess because it seems in sync with your pedal stroke.
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11-17-19, 06:51 PM
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That's pretty loud. You check your pulleys?
11-18-19, 01:43 PM
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I just listened to the video and that sound is pretty “scrapey”. It makes me wonder about 2 possibilities - 1) Could your front derailleur have dropped down a bit due to a loose bolt? If so, the top of the cage could come into contact with some chainring teeth. This would account for an odd noise even though maybe your FD cage is centered properly. Or, 2) Did you recently remove your chain for servicing? If so, is there any chance the chain was run improperly outside the rear derailleur cage? What I mean is that the chain might be running over the top of the little tab on the back of the outer cage plate, as opposed to under it.
I have made both of the above 2 derailleur set-up mistakes at various times over the years. The plot thickens! Once you definitively track down the cause of this silly noise we’ll eagerly await the consolation prize for the correct bike detective!
I have made both of the above 2 derailleur set-up mistakes at various times over the years. The plot thickens! Once you definitively track down the cause of this silly noise we’ll eagerly await the consolation prize for the correct bike detective!
11-18-19, 02:18 PM
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I just listened to the video and that sound is pretty “scrapey”. It makes me wonder about 2 possibilities - 1) Could your front derailleur have dropped down a bit due to a loose bolt? If so, the top of the cage could come into contact with some chainring teeth. This would account for an odd noise even though maybe your FD cage is centered properly. Or, 2) Did you recently remove your chain for servicing? If so, is there any chance the chain was run improperly outside the rear derailleur cage? What I mean is that the chain might be running over the top of the little tab on the back of the outer cage plate, as opposed to under it.
I have made both of the above 2 derailleur set-up mistakes at various times over the years. The plot thickens! Once you definitively track down the cause of this silly noise we’ll eagerly await the consolation prize for the correct bike detective!
I have made both of the above 2 derailleur set-up mistakes at various times over the years. The plot thickens! Once you definitively track down the cause of this silly noise we’ll eagerly await the consolation prize for the correct bike detective!
11-18-19, 03:55 PM
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I just listened to the video and that sound is pretty “scrapey”. It makes me wonder about 2 possibilities - 1) Could your front derailleur have dropped down a bit due to a loose bolt? If so, the top of the cage could come into contact with some chainring teeth. This would account for an odd noise even though maybe your FD cage is centered properly. Or, 2) Did you recently remove your chain for servicing? If so, is there any chance the chain was run improperly outside the rear derailleur cage? What I mean is that the chain might be running over the top of the little tab on the back of the outer cage plate, as opposed to under it.
I have made both of the above 2 derailleur set-up mistakes at various times over the years. The plot thickens! Once you definitively track down the cause of this silly noise we’ll eagerly await the consolation prize for the correct bike detective!
I have made both of the above 2 derailleur set-up mistakes at various times over the years. The plot thickens! Once you definitively track down the cause of this silly noise we’ll eagerly await the consolation prize for the correct bike detective!
11-18-19, 09:09 PM
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so one thing i just realized.. it only happens the day i lube my chain. the day i lube my chain it only happens on lower gears, only when under high torque. as a matter of fact, it goes away towards the end of the ride, and on second day which was today, its completely silent..
11-18-19, 10:25 PM
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That doesn't sound like a chain. Chain rub usually makes a more distinctly metallic pinging sound.
Noise under pressure usually indicates an alignment problem. If it was a steel bike I'd suspect the bottom bracket was flexing and affecting the front derailleur alignment.
A slight irregularity in the crankset can cause some scraping noises, including the chainring rubbing the front derailleur. Check for any wobble in the crankset, watching for the space between the chainring and front derailleur.
Check cable routing. Recently I heard a new scraping noise with my older Trek 5900 on a workstand. The bare cable for the rear derailleur had popped out of the stamped metal guide under the bottom bracket shell and was scraping against the chainring. The cable was already frayed. One more ride and it would have snapped. I'd have been stuck with riding the smallest rear cog and only the double chainring for shifting. My best guess is the cable came out of the guide when I adjusted the cable tension and didn't check the routing along the entire length of cable from shifter to derailleur.
If it's a carbon fiber bike, check for cracks around the bottom bracket shell, chain stays and seat stays.
A chain won't usually make that kind of noise. Maybe if it's filled with grit from really bad riding conditions and oiling it without cleaning.
Some lubes, especially liquefied wax/paraffin, can clog up the spaces between rear cogs and chain links. When that happened with one of my bikes it wasn't any noisier, but there was noticeable drag in the entire drivetrain. I never had that problem with dipping the chain into melted paraffin. But White Lightning Easy Lube made a mess within only a few weeks of using as directed. Since then I would apply it only on a clean chain off the bike, wait for the solvent to evaporate, wipe down the chain before installing it. That's more trouble than using the crock pot with melted paraffin.
Noise under pressure usually indicates an alignment problem. If it was a steel bike I'd suspect the bottom bracket was flexing and affecting the front derailleur alignment.
A slight irregularity in the crankset can cause some scraping noises, including the chainring rubbing the front derailleur. Check for any wobble in the crankset, watching for the space between the chainring and front derailleur.
Check cable routing. Recently I heard a new scraping noise with my older Trek 5900 on a workstand. The bare cable for the rear derailleur had popped out of the stamped metal guide under the bottom bracket shell and was scraping against the chainring. The cable was already frayed. One more ride and it would have snapped. I'd have been stuck with riding the smallest rear cog and only the double chainring for shifting. My best guess is the cable came out of the guide when I adjusted the cable tension and didn't check the routing along the entire length of cable from shifter to derailleur.
If it's a carbon fiber bike, check for cracks around the bottom bracket shell, chain stays and seat stays.
A chain won't usually make that kind of noise. Maybe if it's filled with grit from really bad riding conditions and oiling it without cleaning.
Some lubes, especially liquefied wax/paraffin, can clog up the spaces between rear cogs and chain links. When that happened with one of my bikes it wasn't any noisier, but there was noticeable drag in the entire drivetrain. I never had that problem with dipping the chain into melted paraffin. But White Lightning Easy Lube made a mess within only a few weeks of using as directed. Since then I would apply it only on a clean chain off the bike, wait for the solvent to evaporate, wipe down the chain before installing it. That's more trouble than using the crock pot with melted paraffin.
11-23-19, 10:53 PM
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I'd take off the chain and move all rotating parts - crankset, freehub, pulleys. If none of them rub or make noise it's chain rub. Then carefully reinstall the chain and make sure it's run inside the little tabs in the pulleys, not over them. (Though misrouting the chain through the pulleys would make it hard to pedal I'd think.)
11-23-19, 11:06 PM
#15
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Chainring bolts?
