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Worn Sprockets

#1 2019-10-04 12:23pm

johnny5
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Worn Sprockets

Hey evereyone,

I am currently having a difference of opinion with another member regarding worn out sprockets and how new chains fit with worn out teeth.  I will attach a couple pics showing the sprocket tooth to chain mesh.  He claims that a brand new chain will work just fine on worn out teeth of sprockets.  I know whenever I go over the stretch limit on my mountain bike drive trains a new chain doesn't work properly and slips on the cogs.  Please leave your thoughts.  I do not believe that the pictures I will show you are of useable sprokets.  Your thoughts?  Are these rideable in all honesty?  I told him I would post about it to here all your thoughts.
https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/33402/20191004_0809425d979a896d.jpg
https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/33402/20191004_0808445d979a9738.jpg

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#2 2019-10-04 12:27pm

BRICKOS2
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Re: Worn Sprockets

X

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#3 2019-10-04 12:29pm

johnny5
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Re: Worn Sprockets

BRICKOS2 wrote:

X

but he said these were perfect for survivor builds!  lol

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#4 2019-10-04 12:31pm

its-all-good
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Re: Worn Sprockets

Looks like you have a 3/32 chain on a 1/8 sprocket.


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#5 2019-10-04 12:36pm

Gylles Smyth
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Re: Worn Sprockets

its-all-good wrote:

Looks like you have a 3/32 chain on a 1/8 sprocket.

I thought the same thing; teeth look too big for the chain as opposed to too small from being worn.

I'm still running an '80s Tuf Neck 44T on my race bike with no issues, so no, never had issues with worn sprockets/chainrings other than bending or flexing.


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#6 2019-10-04 12:39pm

Stomper
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Re: Worn Sprockets

its-all-good wrote:

Looks like you have a 3/32 chain on a 1/8 sprocket.

This


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#7 2019-10-04 12:40pm

johnny5
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Re: Worn Sprockets

same result with a used izumi and new z chain.  The chain cant mesh, so I grabbed my chain whip for a quick picture.

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#8 2019-10-04 12:48pm

nintendoninja
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Re: Worn Sprockets

Ya that sprocket is done.


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#9 2019-10-04 12:53pm

spyker
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Re: Worn Sprockets

The teeth on the sprocket are done! The soft alloy used to make sprockets bitd were just not very durable.


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#10 2019-10-04 12:53pm

Kurt_Rad
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Re: Worn Sprockets

Stomper wrote:

its-all-good wrote:

Looks like you have a 3/32 chain on a 1/8 sprocket.

This

Yep. This 100%

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#11 2019-10-04 12:53pm

Hobbes12
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Re: Worn Sprockets

For sure with the chain you’re using is wrong...


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#12 2019-10-04 1:00pm

El Gecko
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Re: Worn Sprockets

Doesn't look completely gone to me. File the sides of the teeth flat where the bulges are and flip the sprocket backwards, and you can still get some life out of it.

This here is about the level they need to get to where they don't really work anymore. Speaking from experience lol
https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/103998/pro_neck_ring_015d97a4b266.jpg
https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/103998/pro_neck_ring_025d97a4b32d.jpg

Last edited by El Gecko (2019-10-04 3:03pm)


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#13 2019-10-04 1:09pm

El Gecko
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Re: Worn Sprockets

btw the reason you can get away with busted up or mismatched chains/sprockets/cogs on a BMX or single speed is because there's constant tension on the chain. The springs in most derailleurs aren't strong enough to keep it from skipping on a road bike or MTB, so they need everything to be matched up and in good condition to work right.

Last edited by El Gecko (2019-10-04 1:10pm)


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#14 2019-10-04 1:13pm

Kurt_Rad
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Re: Worn Sprockets

El Gecko wrote:

btw the reason you can get away with busted up or mismatched chains/sprockets/cogs on a BMX or single speed is because there's constant tension on the chain. The springs in most derailleurs aren't strong enough to keep it from skipping on a road bike or MTB, so they need everything to be matched up and in good condition to work right.

I was just about to say this

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#15 2019-10-04 1:13pm

eric12
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Re: Worn Sprockets

Look at the first pic, that sprocket is done. RIP


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#16 2019-10-04 1:19pm

Hobbes12
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Re: Worn Sprockets

Provide some other pics with other chains on it...


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#17 2019-10-04 2:13pm

showboat booter
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Re: Worn Sprockets

I’m pretty sure the proper chain would fit loosely not tighter, because sprockets wear down, not up. You end up having less material to mesh with the chain and that creates slack, not tension...

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#18 2019-10-04 2:45pm

Erock86
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Re: Worn Sprockets

Bro 100% wrong chain.. crooked teeth of not..


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#19 2019-10-04 3:05pm

Atrains89
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Re: Worn Sprockets

Erock86 wrote:

Bro 100% wrong chain.. crooked teeth of not..

I’m in agreement with everyone. That looks like the wrong chain to me.

Atrains89


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#20 2019-10-04 3:19pm

MAIDEN GT fan
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Re: Worn Sprockets

eric12 wrote:

Look at the first pic, that sprocket is done. RIP

Agree With This! /\/\/\/\
Still the Chain is Not Correct.

Last edited by Maiden DB fan (2019-10-04 3:20pm)

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#21 2019-10-04 3:45pm

johnny5
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Re: Worn Sprockets

I will concede on this to an extent.  I just stopped and picked up a slotted KMC chain for my 17 master and it fits over both sprockets.  The problem with one sprocket especially is that the chain slips in the teeth so it is really done.  the second had a bent tooth next to a couple of smashed teeth.  A hit with a punch and it is straight enough to have the chain seat completely.  I would say that one is okay, but one is dusted.

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#22 2019-10-04 4:16pm

4inCycle
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Re: Worn Sprockets

Is that a chain wrench? Did you try a regular chain?

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#23 2019-10-04 4:20pm

Erock86
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Re: Worn Sprockets

Guy these are my sprockets.... here is my listing... can anyone tell me what I did wrong?? I listed them as 6/10 rating and I clearly listed that they had crooked teeth and imperfections.. I don’t think he even read my description.. cause if he did we all wouldn’t be here
https://bmxmuseum.com/forsale/343924


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#24 2019-10-04 4:36pm

johnny5
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Re: Worn Sprockets

I read the listing, I guess I just missed the picture with the destroyed teeth.  Either way one is worn out and is not a 6 out of ten.  The bigger issue is how you communicate to someone who just purchased something and had a concern.  You want to put me on blast by revealing yourself go ahead.  You have been a horrible seller to deal with and I will not be buying from you again.  Just being aggressive and defensive about your doubts of my concerns wasn't necessary.

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#25 2019-10-04 4:44pm

johnny5
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Re: Worn Sprockets

6 out of ten LOL
https://s3.amazonaws.com/uploads.bmxmuseum.com/user-images/33402/20191004_1643205d97d949c2.jpg

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