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Btwin, Chain Wear Indicator

Sale price: $5.99 Regular price:

A worn chain leads to poor gear changes and the premature wear of sprockets and chainrings.

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Sale price: $5.99 Regular price:

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San Francisco, 735 Market St. Options

Select an available color and size to see options.

Model: 8351086

Product Features

A photo of the Btwin, Chain Wear Indicator in use

Btwin, Chain Wear Indicator is designed for easily checking the wear of your chain.

A worn chain leads to poor gear changes and the premature wear of sprockets and chainrings.

Compact design

Compact, lightweight object.

Easy to use

To be inserted directly in between the links, in the direction of the chain.


Includes 2 gauges for checking the lengthening of the chain.


Stainless steel.

Product Customer Reviews

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433 Reviews
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Btwin, Chain Wear Indicator,base color
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Not Accurate

I have used this Decathlon checker for three years to check an 8-speed drivetrain using the 1-10 speed end of the tool (0.75-1.0% wear). I recently bought a new road bike with 11-speed Shimano 105 groupset and KMC X11 chain. After 4 weeks and about 400 miles I checked chain wear using the 10-12 speed end of the tool (0.2-0.5% wear). Oddly, the Decathlon tool was showing the chain as almost worn. The tool was not yet lying totally flat on the chain, but the end had fallen substantially into the space between the two outer plates. This made no sense on a practically new chain. So I bought the chain checker from a very famous American bike tool company to compare, and this time the 0.5% wear end did not drop into the gap at all. This was the expected result for an almost new chain. I also compared the 0.75% end in the 8-speed chain on my older bike. Again the Decathlon tool dropped significantly, but the tool from the American company showed no wear. This figured, because the 8-speed chain has also done fewer than 400 miles. The Decathlon tool is simply not accurate, full stop; I have also certainly been changing my 8-speed chains in the past too quickly because of it, and thus wasting money. It is £5-6 cheaper than the American company's checker, but over time you will waste much more money replacing chains too soon, if you use the Decathlon tool. Better to pay a little more upfront and save much more money in the longer term. You only buy a chain wear tool once, so make sure that you buy a market-leading one, and not the offering from Decathlon!

Don't waste your money buying this gauge

I've just bought this gauge along with two SRAM PC1110 11 speed chains. Out of curiosity I checked one of the new chains and the gauge showed that it is already 0.5% stretched and so theoretically needs to changed. Same for the other chain so this is no fluke, this gauge is absolutely useless! Would give minus stars if I could as I had to spend money to get to the store to pick it up so am now down money and still no working chain gauge.

Cracking piece of kit.

As i have a new bike, i have not had the chance to use it yet. Triban Rider, not Large.

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Chain wear indicator

Excellent product!

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Seems ok

Not used just yet but seems a sturdy price of essential kit.

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This chain wear indicator

I am usually satisfied with Decathlon products but this is the only time I have reason to review adversely. I have used this chain wear indicator for 6 months and wondered why my 11 speed chains, according to this, have shown to need replacing after on average 6 weeks. I don’t ride hard and only do about 600 miles in that time on the road bike. I maintain and lube after every other ride. I purchased 2 of these as l lost one, but on both of them, I found that when I placed the indicator on a new chain, the indicator showed the chain partially worn which I found strange but thought that was how it is. I then suspected it to give incorrect readings resulting in premature chain replacement and went to a shop to have it measured using a Park Tool CC-3.2 and realised that I have been discarding chains well before they needed replacing. I purchased a Park Tool chain wear indicator and I use this instead of the Decathlon product as it is not correctly sized. On this basis, I can not recommend this product and recommend the Park Tool indicator..

Thank you very much for giving us such valuable feedback regarding this chain wear indicator tool. I will forward this on to our team at Decathlon immediately as this requires some investigation.
Please feel free to return it to us for a refund or an exchange.
Peter, Cycling Manager, DECATHLON
good bit of kit

Built my own ebike was worried about chain stretch this works a treat

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Does the job

Not much more to say

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Good Product

Ment to do what it is made for. Very accurate.

Nástroj není vhodný k měření opotřebení řetězu.

Po lkontrole v servisu jsem si zkontroloval opotřebení řetězu u vás zakoupenou měrkou, a jaké bylo mé překvapení, když mi měrka ukázala, že mám řetěz vyměnit. Pak nevím, kde je tedy pravda.

Dobrý den, Vengi,

velice děkujeme za Váš čas věnovaný recenzi tohoto produktu. Každá zkušenost je velmi cenná a pomáhá nám s vývojem nových modelů.

Je nám líto, že kvalita produktu neodpovídá Vašim požadavkům. Z toho, co popisujete, se domníváme, že by se mohlo jednat o vadný kus.Ráda bych Vás proto pozvala na Vaši nejbližší prodejnu Decathlon, kde můžete produkt reklamovat.

Omlouváme se za komplikace.

S láskou ke sportu




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Fajna měrka

Fajná měrka, dokáže vám ušetřit dost peněz za případnou výměnu kazety. Měl jsem čínskou a ta mi celou dobu lhala a stálo mě to kromě řetězu i novou kazetu.

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Levné, zato nepřesné

Měrka naměří trochu více, než by měla - a na novém řetězu, který má protažení naprosto zanedbatelné (měřeno, od standardu se liší o cca 0.1%), naměří opotřebení 0.5%.

Bez problémů plní svou funkci.

Tištěný popis by mohl být lépe čitelný.

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Dobrá věc na měření opotřebení řetězu

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Additional Product Information



  • 100% Steel



Superior quality. Unbeatable prices.

For 40 years, Decathlon has delivered the best value in the retail sports industry by offering high-quality, sustainable and cost-effective products.

Decathlon makes the difference
  1. product-research

    Research and development

    delivers high-quality cost-effective products

  2. State-of-the-art production processes

    minimize manufacturing costs

  3. Optimized supply chain

    reduces retail prices

  4. laptop-checkout

    Minimal retail footprint

    lowers overhead and indirect costs


Size Guide Visual