Is Shimano's TL-CN42 the only reliable tool for chain wear? - Bike Forums (2024)

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Is Shimano's TL-CN42 the only reliable tool for chain wear? - Bike Forums (1)12-15-14, 09:53 AM

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anga

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Is Shimano's TL-CN42 the only reliable tool for chain wear?

https://pardo.net/bike/pic/fail-004/0...easuring-tools
Above article claims that Shimano's TL-CN42 is the only tool that correctly measures chain wear.
What do you think?

Is Shimano's TL-CN42 the only reliable tool for chain wear? - Bike Forums (2)

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Is Shimano's TL-CN42 the only reliable tool for chain wear? - Bike Forums (3)12-15-14, 09:55 AM

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There are two reliable tools for measuring wear:
a) Steel ruler
b) The Shimano tool

I use the latter.

ETA: I use the TL-CN41. I wasn't aware they had changed the design.
It looks like it works on the same principle, but sells for half the price.

Last edited by Shimagnolo; 12-15-14 at 10:01 AM.

Is Shimano's TL-CN42 the only reliable tool for chain wear? - Bike Forums (5)

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Is Shimano's TL-CN42 the only reliable tool for chain wear? - Bike Forums (6)12-15-14, 10:19 AM

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purchase yourself a Park Chain Checker

Is Shimano's TL-CN42 the only reliable tool for chain wear? - Bike Forums (8)

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Is Shimano's TL-CN42 the only reliable tool for chain wear? - Bike Forums (9)12-15-14, 11:10 AM

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Originally Posted by lowbike

purchase yourself a Park Chain Checker

The Park tool is ok but the real definitive chain wear guide is a decent steel or aluminum ruler. Measure over 24 pins. On a new chain it should be almost exactly 12.00". If it measures 12-1/1/16" your chain is ok. If it measures 12-1/8", it's replacement time and possibly cassette replacement time also.

Is Shimano's TL-CN42 the only reliable tool for chain wear? - Bike Forums (10)

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Is Shimano's TL-CN42 the only reliable tool for chain wear? - Bike Forums (11)12-15-14, 11:16 AM

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Here's my chain-checker. Since I had to use a hand to operate the camera, I couldn't capture using one hand to hold the chain taut:

Is Shimano's TL-CN42 the only reliable tool for chain wear? - Bike Forums (14)

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Originally Posted by noglider

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Is Shimano's TL-CN42 the only reliable tool for chain wear? - Bike Forums (15)

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Is Shimano's TL-CN42 the only reliable tool for chain wear? - Bike Forums (16)12-15-14, 11:25 AM

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I have had the Rohloff for years and use it as a guide. When it shows a chain is worn out I then use a ruler. I replace at 1/16" in 12".

Is Shimano's TL-CN42 the only reliable tool for chain wear? - Bike Forums (17)

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Is Shimano's TL-CN42 the only reliable tool for chain wear? - Bike Forums (18)12-15-14, 11:39 AM

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Chain checkers are best used by people who want a simple go/no-go device for checking chain wear. Most won't give you the optimum answer, but they're good enough. I've got a cheap one with measurements for 0.5% and 0.75%. If it fails at 0.5%, I order a new chain, when it fails at 0.75% I plan to replace the next time I'm doing maintenance (Yes, I check the new chain to validate that it passes the 0.5%). I'm sure I could use the chain longer, but I tend to get relatively long life from the chain, and they aren't that expensive (9/10-speed bikes).

If you want to maximize chain life, the accurate measurements are key. If you're more of a mind-set of preventative early replacement a simple $5 chain checker is plenty good.

Is Shimano's TL-CN42 the only reliable tool for chain wear? - Bike Forums (19)

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Is Shimano's TL-CN42 the only reliable tool for chain wear? - Bike Forums (20)12-15-14, 11:44 AM

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My chain checker is the calendar. New chain every two years whether I need it or not.

Is Shimano's TL-CN42 the only reliable tool for chain wear? - Bike Forums (22)

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Is Shimano's TL-CN42 the only reliable tool for chain wear? - Bike Forums (23)12-15-14, 11:44 AM

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Originally Posted by davidad

I have had the Rohloff for years and use it as a guide. When it shows a chain is worn out I then use a ruler. I replace at 1/16" in 12".

My procedure too. I first use the Park Tool chain checker as a guide, then confirm if chain should be tossed with a 15" ruler.

Is Shimano's TL-CN42 the only reliable tool for chain wear? - Bike Forums (25)

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Is Shimano's TL-CN42 the only reliable tool for chain wear? - Bike Forums (26)12-15-14, 11:45 AM

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Like Data? KMC has a digital LCD display chain wear checker KMC Digital Chain Checker

Is Shimano's TL-CN42 the only reliable tool for chain wear? - Bike Forums (27)

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FBinNY

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Chain stretch (wear) isn't something to be anal about. From a pure accuracy standpoint, a 12" steel rule is probably the most accurate because most of the checkers exaggerate stretch by mixing roller play with stretch. This is an issue because the sample is so small.

But, keep in mind that stretch (pin wear) isn't the only wear. There's also roller wear (increase in roller play) that is equally important though we don't measure it. There's no rigid rule for the relative wear rates at the pin and the roller, so even with the most accurate tool in existence you only have a ROUGH INDICATION of the condition of the chain. That's OK, because the 1/16" per 12" rule itself is only a ROUGH GUIDELINE.

In the final analysis, you're making a rough measurement of the chain wear, then comparing it to a rough rule of thumb. So any attempt at precision is an act of self deception. Buy a tool or use a ruler to kind of know where things stand, but don't go crazy over it because all that matters is getting into the right ball park.

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Is Shimano's TL-CN42 the only reliable tool for chain wear? - Bike Forums (30)

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Is Shimano's TL-CN42 the only reliable tool for chain wear? - Bike Forums (31)12-15-14, 12:47 PM

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Found Old Full bushing Chains On my single /IGH Drive trains , to last much longer than a 5~8 speed Derailleur chains .

largely a Surface area increase sharing the load .. now Most-all derailleur chains Punch the inner-link in such a way to create a flange ,
out of the steel as the Hole is Made .

The edges of the roller ride on that , so not much surface area ... But the Click shifters work faster, because the chain is Laterally Flexible .
+ no little bushing tubes to make, so that now dominates the market ..

Is Shimano's TL-CN42 the only reliable tool for chain wear? - Bike Forums (32)

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Is Shimano's TL-CN42 the only reliable tool for chain wear? - Bike Forums (33)12-15-14, 05:24 PM

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Typical Shim BS!

Is Shimano's TL-CN42 the only reliable tool for chain wear? - Bike Forums (35)

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Is Shimano's TL-CN42 the only reliable tool for chain wear? - Bike Forums (36)12-15-14, 06:05 PM

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I agree with FB - buying ANY type of chain gauge when you only have a few personal bikes is nothing but a feel-good exercise for someone who wants to have every tool, whether needed or not. The Park tool and other similar ones are nothing more than a great way for shops to sell more chains.

Is Shimano's TL-CN42 the only reliable tool for chain wear? - Bike Forums (37)

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Is Shimano's TL-CN42 the only reliable tool for chain wear? - Bike Forums (38)12-15-14, 06:06 PM

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When I use my steel ruler I also go from 1" - 13". Makes it a little easier to center things.

Is Shimano's TL-CN42 the only reliable tool for chain wear? - Bike Forums (40)

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Is Shimano's TL-CN42 the only reliable tool for chain wear? - Bike Forums (41)12-15-14, 06:32 PM

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If you take out your chain for cleaning and lubing, you can hang it alongside a new one and compare length. 1% over 100 links is 1/2", so it's easy to see.

Is Shimano's TL-CN42 the only reliable tool for chain wear? - Bike Forums (44)

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Is Shimano's TL-CN42 the only reliable tool for chain wear? - Bike Forums (45)12-15-14, 06:46 PM

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the pedros one works like the shimano. we use the rohloff with good results in the shop. we have used the rohloff for many years. at least 10

Is Shimano's TL-CN42 the only reliable tool for chain wear? - Bike Forums (46)

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Is Shimano's TL-CN42 the only reliable tool for chain wear? - Bike Forums (47)12-15-14, 07:57 PM

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I am retired, spend winters in Southern AZ so ride every day, avg 20 miles every day with usually a five or six bike rotation, maintain 9 bikes for me and 5 for daughters and in-laws, and find the accuracy and speed in using a 15" steel rule unbeatable. However, I remember a time when if I took an extra minute to do maintenance on the bike it would cut my ride by that amount, so back then a less accurate but quick check would be well worth the money.

Is Shimano's TL-CN42 the only reliable tool for chain wear? - Bike Forums (49)

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