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just bought bike and chain worn out?!?

Old 03-02-17, 02:22 PM
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acorn54
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just bought bike and chain worn out?!?

i bought my bike last week and just checked the chain wear, with the park chain wear tool. i was shocked to see the the tool measured ".50" on the tool gauge. i am curious if any other people have checked their new chains and have gotten the same reading. the chain model, by the way is a kmc z72 narrow.
cc 3.2 is the park chain tool model. it has two measurments one is .75 so i assume the chain is okay until that readings is met by the wear length on my bike's chain.


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Old 03-02-17, 02:24 PM
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dsbrantjr
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Throw away the chain checker and check the chain against a decent steel rule. You are not the first to have gotten a 0.50 wear reading on a new chain.
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Old 03-02-17, 02:58 PM
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I wouldn't toss it, but I would verify with a steel rule to determine how far off it is and use with discretion.
My CC doesn't show wear with a new chain. When it does, I'll check it against a rule.
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Old 03-02-17, 03:39 PM
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Talked to the selling Bike Shop Yet?
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Old 03-02-17, 03:54 PM
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Originally Posted by dsbrantjr View Post
Throw away the chain checker and check the chain against a decent steel rule. You are not the first to have gotten a 0.50 wear reading on a new chain.
+1000000

The checker tools only make sense if you're working in a shop where you want to be able to check very, very quickly, and it's to your benefit if the tool tells you to replace the chain prematurely. In fact I'm surprised shops don't give the tools away free to help increase chain sales.
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Old 03-02-17, 04:15 PM
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Originally Posted by fietsbob View Post
Talked to the selling Bike Shop Yet?
i am making a "list" before i contact bikesdirect, however i won't expect much,as i just checked my newly installed kmc z72 narrow chain on my other bike, and it also reads stretch of ".50". the other bike is a fuji absolute 5.0 bought at the lbs. like others have said, the park tool must be reading inaccurately and is just a rough quick guide that can be used for low end bicycles.
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Old 03-02-17, 04:26 PM
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Oh Those guys, .. Now you pay the cost you saved Not buying a bike from a retail shop.

ready to box it up and send it Back?
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Old 03-02-17, 04:28 PM
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I think you're more likely looking at variations in tolerances around new chains rather than problems with the Park tool which does tend to be overly conservative if you always replace at .5% when you can first force the it in. I've had new chains that with a little pressure, I can fit the .5% bar in, but typically this happens after a few thousand miles. I wouldn't get terribly excited about it, just wait until you get above the .75% line.

- Mark
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Old 03-02-17, 04:28 PM
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acorn54
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Originally Posted by markjenn View Post
I think you're more likely looking at variations in tolerances around new chains rather than problems with the Park tool. I've had new chains that with a little pressure, I can fit the .5% bar in, but typically this happens after a few thousand miles. I wouldn't get terribly excited about it, just wait until you get above the .75% line.

- Mark
i agree 100%
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Old 03-02-17, 05:07 PM
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Originally Posted by markjenn View Post
I think you're more likely looking at variations in tolerances around new chains rather than problems with the Park tool which does tend to be overly conservative if you always replace at .5% when you can first force the it in. I've had new chains that with a little pressure, I can fit the .5% bar in, but typically this happens after a few thousand miles. I wouldn't get terribly excited about it, just wait until you get above the .75% line.

- Mark
Or measure with a rule and be certain of where you stand. I would say that a 0.5% indication on a new chain was beyond " overly conservative".
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Old 03-02-17, 05:10 PM
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Originally Posted by Kopsis View Post
+1000000

The checker tools only make sense if you're working in a shop where you want to be able to check very, very quickly, and it's to your benefit if the tool tells you to replace the chain prematurely. In fact I'm surprised shops don't give the tools away free to help increase chain sales.
Before you throw away your park chain-checking tool, seems to me it makes sense to just measure it first with your preferred brand of ruler, if consensus is that Park doesn't make their tool to the correct length.
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Old 03-02-17, 05:24 PM
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Originally Posted by Sy Reene View Post
Before you throw away your park chain-checking tool, seems to me it makes sense to just measure it first with your preferred brand of ruler, if consensus is that Park doesn't make their tool to the correct length.
The problem isn't length, it's that play in the rollers affects the measurement but is not actually indicative of the wear you're trying to measure (wear at the pin/plate interface). Using a ruler to measure pin to pin over a certain number of links takes roller play completely out of the picture.
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Old 03-02-17, 05:50 PM
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Originally Posted by Kopsis View Post
The problem isn't length, it's that play in the rollers affects the measurement but is not actually indicative of the wear you're trying to measure (wear at the pin/plate interface). Using a ruler to measure pin to pin over a certain number of links takes roller play completely out of the picture.
but the teeth on a cog have to fit between the rollers at a fixed distance? Why is the pin distance important?
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Old 03-02-17, 06:03 PM
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okay i counted 24 rivets for 12 inches using my micrometer, so that's that. for a brand new kmc chain z72 .

Last edited by acorn54; 03-02-17 at 06:04 PM. Reason: added info
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Old 03-03-17, 04:46 AM
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Originally Posted by Sy Reene View Post
but the teeth on a cog have to fit between the rollers at a fixed distance? Why is the pin distance important?
When in use, the rollers will all be biased the same direction. But almost all checking tools bias the rollers at each end of the tool in opposite directions. Here's the classic explanation (with lots of really good illustrations): https://pardo.net/bike/pic/fail-004/000.html
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Old 03-03-17, 01:19 PM
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Or you can use one of these instead:

Chain Checker Plus Pedro's NA
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Old 03-03-17, 02:51 PM
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Originally Posted by acorn54 View Post
okay i counted 24 rivets for 12 inches using my micrometer, so that's that. for a brand new kmc chain z72 .
I'm curious, what conclusion did you draw from this? And what micrometer measures 12 inches?
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Old 03-03-17, 03:48 PM
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Originally Posted by Andy_K View Post
I'm curious, what conclusion did you draw from this? And what micrometer measures 12 inches?
sorry im not tech savy i meant my caliper measured 24 rivets in 12 inches. on a new bike chain there are 24 chain rivets per 12 inches as far as i am aware


Bicycle chain wear explained - BikeRadar USA
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Old 03-03-17, 04:09 PM
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Originally Posted by acorn54 View Post
sorry im not tech savy i meant my caliper measured 24 rivets in 12 inches. on a new bike chain there are 24 chain rivets per 12 inches as far as i am aware
So your new chain is fine, right?
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Old 03-03-17, 04:29 PM
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Originally Posted by Andy_K View Post
So your new chain is fine, right?
yes, im newly involved in the mechanics of bicycles so i see bike problems "in my soup" as the saying goes.
this is my first experience putting together my own bike and maintenance of it. i use to just drop my bike off at the local bike shop and let them fix and maintain it.
now that i am retired i have time to learn about the mechanical aspect of bikes.
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