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Drivetrain so loud! why? Video!

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Drivetrain so loud! why? Video!

Old 02-23-19, 10:04 AM
  #1  
Terranova
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Drivetrain so loud! why? Video!

Hey guys,
first of all, i have to apologize for my english. it is not the best, but i hope, you will understand =)
i have allready built up a new fixed gear bike (all parts new!). it is my first fixed gear bike, so i have no experience with this Kind of bikes.
the drivetrain is really loud. mouch louder than any of my other bikes. the parts of the drivetrain are all for 1/8" and there is enough lube on it. the chain-line seemd to be perfect for me and i have no idea, why the drivetrain is so loud.
i made two Videos to demonstrate the issues:
the first one with chain.

the second Video without chain, to demonstarte, that the parts are running smooth. i guess, the is no issue with the Bottom bracket, the hub or the cog-/chain-ring.

can you help me?
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Old 02-23-19, 10:08 AM
  #2  
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sorry guys,
i recognize, that i have at least to post 10 Posts, until i am allowed to send URLs. so i try it on this way:
1. Video: vimeo.(com)/319173640?utm_source=email&utm_medium=vimeo-cliptranscode-201504&utm_campaign=29220&utm_term=1199456
2. Video vimeo.(com)/319189377?utm_source=email&utm_medium=vimeo-cliptranscode-201504&utm_campaign=29220&utm_term=1199458

you have to remove the "()" from the two links above…
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Old 02-23-19, 10:32 AM
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seau grateau
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Probably a combination of chain tightness and new parts. In the first demonstration, the chain is too tight. It's noticeably quieter in the demonstration with the loose chain, and while that's probably too much slack to safely ride on the road, you can ease up on the tightness and it should run quieter. New parts are sometimes noisier also, so give it a little time to wear in.
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Old 02-23-19, 11:43 AM
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eh doesn't sound too bad, fixed gears aren't exactly whisper quite. drivetrain will smooth out a bit with time as parts mesh. what chain and cog are you using? izumo eco chain for example are quite noisy.
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Old 02-23-19, 12:13 PM
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Thank you for your support so far!
I am Looking for the "sweet spot" in chain stiffnes, so i can ride safe and not too noisy.
You are right, REDMASTA, I use the izumo Standard track chain and a "goldsprint track cock".
proably it is just a matter of time to mesh up. but i am really suprised, how loud this Setup is.
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Old 02-23-19, 12:26 PM
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i believe the eco and standard track are the same thing. tough chains, but can be noisy. prefer kmc 710 myself.
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Old 02-23-19, 06:24 PM
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The clicking noise is caused by chordal action.

Some combinations of front/rear sprockets can be louder than others. I believe smaller is going to be louder.



-Tim-

Last edited by TimothyH; 02-23-19 at 06:28 PM.
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Old 02-24-19, 04:20 AM
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wow. Now its getting serious
thank you, for the video! I think i get the main part of it and have understand the fundamentials. Bit what ist now the conclusion for me? What combination of sprocket and chainring should i choose?
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Old 02-25-19, 08:26 AM
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Originally Posted by Terranova View Post
wow. Now its getting serious
thank you, for the video! I think i get the main part of it and have understand the fundamentials. Bit what ist now the conclusion for me? What combination of sprocket and chainring should i choose?
in basic theory, a large/large combination should give you a quieter and smoother drivetrain. This is directly tied to the space between chain links. (1/2” or 12.7mm) the smaller you go the harder it is for the chain to properly wrap around the sprocket. This increases noise, friction, as well as chain and sprocket tooth wear over time. You may not notice a considerably ‘smoother’ drivetrain for your investment though, because we’re talking about small numbers here. In short, there’s no ‘magic’ combination. (I run 53/19, for everyday riding for FYI) Having said that, any typical fixed/ss combination such as 48/17 for example is perfectly fine and shouldn’t be ‘noisy’ simply because of the sprocket size. You likely wouldn’t notice anything as far as serious noise and friction unless you were trying to use sprockets that are say, smaller than 15t. Another way to smooth out a drivetrain would be to use sprockets that have teeth with smoother profiles. Rounded/bevelled smooth edges. Compare an EAI sprocket with the teeth on a Dura-Ace sprocket for example.

Beyond that, make sure your chainline and chain tension are correct, and you should be fine. Don’t over lubricate your chain. If it’s still ‘noisy’ you could try replacing your chain. If that doesn’t work, as other have suggested, it will likely quiet up over time as typical wear happens and the chain and teeth better ‘mesh’ up.

Last edited by seamuis; 02-25-19 at 08:31 AM.
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Old 02-25-19, 02:33 PM
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Originally Posted by seamuis View Post
in basic theory, a large/large combination should give you a quieter and smoother drivetrain. This is directly tied to the space between chain links. (1/2” or 12.7mm) the smaller you go the harder it is for the chain to properly wrap around the sprocket. This increases noise, friction, as well as chain and sprocket tooth wear over time. You may not notice a considerably ‘smoother’ drivetrain for your investment though, because we’re talking about small numbers here. In short, there’s no ‘magic’ combination. (I run 53/19, for everyday riding for FYI) Having said that, any typical fixed/ss combination such as 48/17 for example is perfectly fine and shouldn’t be ‘noisy’ simply because of the sprocket size. You likely wouldn’t notice anything as far as serious noise and friction unless you were trying to use sprockets that are say, smaller than 15t. Another way to smooth out a drivetrain would be to use sprockets that have teeth with smoother profiles. Rounded/bevelled smooth edges. Compare an EAI sprocket with the teeth on a Dura-Ace sprocket for example.

Beyond that, make sure your chainline and chain tension are correct, and you should be fine. Don’t over lubricate your chain. If it’s still ‘noisy’ you could try replacing your chain. If that doesn’t work, as other have suggested, it will likely quiet up over time as typical wear happens and the chain and teeth better ‘mesh’ up.
This is very well stated.

Bolded for emphasis.


-Tim-
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Old 02-25-19, 03:05 PM
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Thank you very much, seamuis!
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Old 02-25-19, 07:25 PM
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Originally Posted by Terranova View Post
I am Looking for the "sweet spot" in chain stiffnes, so i can ride safe and not too noisy.
In your first demo, notice how the chain makes a lot of chatter when it is in the tight spot of the rotation. I like to take note of the position of the crank at the tight spot and adjust my chain with the crank in that position. This will make sure the chain never binds up in the tight part of the rotation (unless I try to make it too tight). If the chain ends up much too slack during the rest of the rotation you can try Sheldon Brown's method of centering the chainring. Loosen the chainring bolts a little bit, rotate the cranks to the position that causes the most chain tension, then firmly tap the chain with your 15mm wrench. Should move the chainring to a more central position, but it's not very exact and you are likely to have another high spot. Keep at it until the variation is acceptable then tighten down the bolts in a star formation (incrementally and not by going round the chainring tightening adjacent bolts, for a 5-bolt attachment I do every other bolt in a clockwise direction, this hits all the bolts in a star-formation).
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Old 02-25-19, 07:59 PM
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I run the $20 Izumo chains (Eco? Standard? I don't pay attention) and Eurasian 1/8" cogs. I like that the two feel rock solid. The noise is what it is. Varies but sometimes surprisingly louder than my geared bikes. I'm guessing the fact that there is little rounding or softening of edges on either the chain plates or cog is the cause of much of the noise. I have a Surley cog that is far quieter but it feels like the chain might derail at any time when I run it on my bike with a lesser crankset where the chain goes quite slack in places. I've run one KMC chain. Same feeling. I"ll stick to the noisy stuff for the peace of mind knowing that throwing a chain is very unlikely with those parts and I can ride with plenty of chain slack and never stress the BB or hub bearings. (A lot of the track guys run the same stuff. I figure they know something.)

Ben
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