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Cog life

Old 09-30-18, 08:09 PM
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bonsai171
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Cog life

Hi,

I put this 16t Dura Ace cog on my bike a few days ago, and it was making some noise. Can anyone tell me if it's worn? Was trying to decide if it's just worn out and needs replacement, or if I should measure it to see if the noise was due to a difference in chainline between my old cog and this one. Thanks!

Dave
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Old 09-30-18, 08:16 PM
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It looks fine. Some cogs run a little more noisy than others. You could switch it out for something else if the noise bothers you, but I'd just make sure the whole drivetrain is clean and chain is lubed, and not worry about it. You're never going to have a silent drivetrain for very long.
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Old 09-30-18, 08:23 PM
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If you can’t see a difference in your chainline without breaking out the callipers to measure it, then there’s really no chance that your chainline is the issue. Dura ace cogs are designed for racing. The tooth shape/profile, is designed for strength and positive engagement under heavy torque load. Some cogs are designed with smoother, rounder teeth profiles. My guess is this what’s causing the noise you’re hearing and I would guess it will get quieter over time. From what I can see in the photo, the teeth look fine. But if you’re asking if it’s worn, am I to assume you bought a used cog?

Last edited by seamuis; 09-30-18 at 08:27 PM.
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Old 09-30-18, 08:30 PM
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Originally Posted by seau grateau View Post
It looks fine. Some cogs run a little more noisy than others. You could switch it out for something else if the noise bothers you, but I'd just make sure the whole drivetrain is clean and chain is lubed, and not worry about it. You're never going to have a silent drivetrain for very long.
Very cool. Was hoping to take this thing out for a spin. My chain is a little bit on the dirtier side right now, did some fixed riding last weekend on a paved trail that has a lot of dirt, that might be why. Rode some Singlespeed gravel this weekend too, maybe it's time for a good clean. Amazing how fast the chain gets dirty!

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Old 09-30-18, 08:37 PM
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Originally Posted by seamuis View Post
If you can’t see a difference in your chainline without breaking out the callipers to measure it, then there’s really no chance that your chainline is the issue. Dura ace cogs are designed for racing. The tooth shape/profile, is designed for strength and positive engagement under heavy torque load. Some cogs are designed with smoother, rounder teeth profiles. My guess is this what’s causing the noise you’re hearing and I would guess it will get quieter over time. From what I can see in the photo, the teeth look fine. But if you’re asking if it’s worn, am I to assume you bought a used cog?
I'll have to put the cog back on and really check out the chainline to see if there's a visible difference. Thanks for the background on the DA, almost sounds like its part of the design.

The cog came from a friend. I'm running a 17t now, and wanted to try a 16 T. Its got some miles on it, but I found out the 16 T could fit on one side, and I can run a 17t freewheel without changing the chain length. Going to take this thing for a good spin!

Dave
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Old 09-30-18, 08:40 PM
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Yeah, it's tough to keep on top of the cleaning, but having a drivetrain free of dirt, gunk, and grime makes a pretty significant difference.
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Old 09-30-18, 08:59 PM
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Originally Posted by bonsai171 View Post
I'll have to put the cog back on and really check out the chainline to see if there's a visible difference. Thanks for the background on the DA, almost sounds like its part of the design.

The cog came from a friend. I'm running a 17t now, and wanted to try a 16 T. Its got some miles on it, but I found out the 16 T could fit on one side, and I can run a 17t freewheel without changing the chain length. Going to take this thing for a good spin!

Dave
It is a part of the design. Anything with the Dura Ace name is designed specifically for racing. Not all fixed cogs are for racing and the tooth shape/profile, even the specific metal of the cog or any plating on the metal can make a difference. Shimano has done a lot of experimenting over the decades with teeth profiles and even teeth pitch. Of course none of that guarantees this is what is causing your noise. You could just need to clean your chain.
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Old 09-30-18, 10:46 PM
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That cog looks like it has very little wear. I'm curious how the back of it looks, are the teeth silver from the black coating wearing off?

Despite the cog being used, it could just be that the cog is less worn than your chain and the tiny difference in spacing is making the noise. Most times when you introduce a new part (cog, chain or chainring) there is a break-in period where there will be some noise, but it'll quiet down after you put in some miles.
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Old 10-01-18, 04:55 AM
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Originally Posted by hardboiled718 View Post
That cog looks like it has very little wear. I'm curious how the back of it looks, are the teeth silver from the black coating wearing off?

Despite the cog being used, it could just be that the cog is less worn than your chain and the tiny difference in spacing is making the noise. Most times when you introduce a new part (cog, chain or chainring) there is a break-in period where there will be some noise, but it'll quiet down after you put in some miles.
The teeth do look silver. I measured the chain recently, and it is well beyond .75%. The chain tool drops in very easily on the .75% side. I have a new chain lying around if it will help.

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Old 10-01-18, 06:47 AM
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You might want to change you chain, but I have a feeling it'll still be a bit noisy in the beginning. As long as your chain line and tension is good, just need to give the parts time to mesh together and things usually quiet down.
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Old 10-01-18, 07:16 AM
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Installing a new unstretched chain should definitely help. Dura Ace cogs are not necessarily noisy, depending on the chain that is used. I have a 16T 1/8” DA cog on two of my fixed gear bikes with a SRAM PC-7X chain, and they are both nearly silent.
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Old 10-01-18, 07:23 AM
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Originally Posted by hardboiled718 View Post
You might want to change you chain, but I have a feeling it'll still be a bit noisy in the beginning. As long as your chain line and tension is good, just need to give the parts time to mesh together and things usually quiet down.
Agree, the SS chain is usually changed with a new cog. Measure your chain against new spec or chain or good one on another SS bike. The park chain wear indicator tool CC-3.2 makes this task simple and consistent.
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Old 10-01-18, 10:12 AM
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I used the Park cc-3.2 to measure the chain.. >.75% wear.

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Old 10-01-18, 10:46 AM
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Originally Posted by bonsai171 View Post
I used the Park cc-3.2 to measure the chain.. >.75% wear.

Dave
yea, buy a new chain. If your chain is that worn, it’s the most likely cause of the noise as the chain rollers aren’t seating properly between the cog teeth.
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Old 10-01-18, 07:31 PM
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Originally Posted by seamuis View Post

yea, buy a new chain. If your chain is that worn, it’s the most likely cause of the noise as the chain rollers aren’t seating properly between the cog teeth.
Got a KMC Z410 laying around. Got the cog cleaned up a bit, and it runs nice now. I'll probably swap the chain this weekend, and maybe the lockring too. It is made of soft metal, and three notches deformed a bit when I removed it and re-installed it.

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Old 10-01-18, 07:48 PM
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Originally Posted by bonsai171 View Post
Got a KMC Z410 laying around. Got the cog cleaned up a bit, and it runs nice now. I'll probably swap the chain this weekend, and maybe the lockring too. It is made of soft metal, and three notches deformed a bit when I removed it and re-installed it.

Dave
Nothing beats a standard dura ace lockring for quality v price.
https://www.retro-gression.com/colle...a-ace-lockring
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