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How to Read the CC-3.2
<0.5% Wear
This chain has less than 0.5% wear, which is acceptable on all derailleur and single-speed drivetrains.
≥0.5% Wear
This chain has at least 0.5% wear. 11-to-12-speed chains should be replaced at or before this measurement.
≥0.75% Wear
This chain has at least 0.75% wear. 5-to-10-speed chains should be replaced at or before this measurement.
TRUSTED SINCE 1963
Since our origins in the back of a bike shop in 1963, it has been Park Tool's sole mission to design and manufacture high-quality tools that empower mechanics and riders of all skill levels to service their bicycles. As with our other 500+ tools, our chain tools are a product of our decades of experience and expertise in the industry, in the shop and on the trail.
Bensage1
Reviewed in the United States on January 9, 2025
Very simple tool that will help me avoid a broken chain. Every biker should have one.
mk
Reviewed in the United States on September 27, 2024
As intended. Cheap effective tool that every bike should have in their tool box.
H
Reviewed in the United Kingdom on August 13, 2024
Finish isn't great but seems precise enough for a simple tool.
Alex
Reviewed in the United States on December 23, 2024
Overpriced like all ParkTool tools, but very handy tool for any cyclist to keep up with transmission maintenance. The tool is easy to use, and it works - tested on a brand new and a really old worn chain.
Anthony
Reviewed in the United States on October 8, 2024
Had no idea how ez it is to check chain wear/stretch with this. Solid metal product, so it should last longer than I will. Price point is decent, so all in all I recommend it.
Mitch
Reviewed in the United States on October 26, 2024
Quick and easy to use go/no-go gauge. With it being a Park Tool I trust it is accurate but we shall see!
Doc
Reviewed in the United States on December 30, 2023
This is simple to use and gives a clear decisive answer to the question of when to replace your chain. Provides to “measures of stretch” or tolerances. Should last forever.
William Lim
Reviewed in Singapore on October 5, 2022
Good tool to check the chain.
Alexander L.
Reviewed in Canada on February 15, 2021
What's not to like about this item? This chain wear indicator provides a very precise idea of how much wear one's chain has. In this way, one can easily gauge when his or her chain needs to be replaced, which can end up saving a lot of money in cassette replacement down the road.The Park Tool chain wear indicator is more expensive than other off-brand chain wear indicators on Amazon, but in my opinion this one is worth the added expense. Most wear indicators on Amazon test for a chain stretch of either 0.75 or 1%, but this one from Park Tool checks for 0.5 or 0.75% stretch instead. The 0.5% measurement is especially useful for chains that are designed for cassettes with more than 10 cogs, which includes a lot of road bikes. Unless one primarily rides something like a single-speed bike, the Park Tool is way more versatile.
Pedro R.
Reviewed in Mexico on January 15, 2021
Para mi es importante tener mi bicicleta al 100% y evitar gastos mayores por desgaste de cadena. Esta herramienta es muy facil de usar y util para detectar cuando es necesario reemplazar la cadena de la bicicleta de 12 velocidades. Si una cadena no se reemplaza a tiempo, puede dañar todas las estrellas de los cambios de la bici y arreglar esto es muy costoso.
NashvilleKeith
Reviewed in the United States on October 3, 2019
This is about the most specific tool you can buy. It does nothing but measure your Road bike chain fitness and let you know if it's time for a chain replacement. That's it. It can't do anything else. And lord knows I've tried. I've tried to make a jailhouse shiv out of it: failure; as dull as a butter knife. I've tried to use two as chopsticks at my local Vietnamese Pho restaurant: no dice. I've tried to re-market these as metal back scratchers: One person with a really itchy back bought one but ended up using it for it's intended purpose: to see if your bike chain is stretched beyond its useful life. And for that it's magic! What I really like about this tool is that it has a .5 inch measure (and also a .75 inch measure) that is a finer indicator for high end road bikes. I like to replace my chain when the .5 inch indicator slips too low into the chain links. It's a low tech tool that really is a bit of genius. Any serious or semi-serious Fred should own one.
Tony Cappadonna
Reviewed in Italy on November 5, 2017
In famiglia abbiamo 5 biciclette di varie tipologie, senza contare quelle di amici e parenti. In pratica penso io alla manutenzione di tutte per quanto mi è possibile oppure le porto dal meccanico ciclista amico per i lavori un po' più impegnativi.Confrontato l'attrezzino con altri similari lo ritengo molto valido perchè meno tollerante di quelli che illudono di avere una catena ancora buona quando invece era da cambiare già da tempo. Mi riferisco ad attrezzi simili a questo ma che, invece di indicare un allungamento già allo 0,5 %, entrano tra le maglie solo quando l'usura è già allo 0,75 %.Allo 0,75 % di allungamento la catena è già da cambiare ed è meglio cambiarla subito a meno di voler poi sostituire come minimo almeno anche il pacco pignoni.In passato (remoto) ho commesso più volte l'errore di aspettare QUASI l'indicazione di un altro attrezzo che ancora non passava all' 1,0 % e, tutte le volte, ho dovuto poi cambiare subito anche il pacco pignoni perchè la trasmissione rumoreggiava, grattava e, ogni tanto, la catena scavallava i denti dei pignoni. Si può ben immaginare che in quelle condizioni anche una catena nuova fa presto a "friggersi" lei stessa !!! e ... ci si può anche far male, soprattutto se in mezzo al traffico in strada.Ora ho l'abitudine di sostituire le catene subito o poco dopo che questo attrezzo ParkTool 4001186 mi segnala un allungamento dello 0,5 % e i pacchi pignoni digeriscono parecchi cambi di catena. Ovvio che si consumano anche loro usandoli ma molto meno.Questo attrezzo è inciso con scritte chiare e indelebili, è in acciaio con nichelatura satinata, pesa 44 grammi (su bilancina elettronica), è lungo 175 mm, largo max 50 mm e spesso 1,9 mm. La finitura è molto soddisfacente pur essendo un oggetto molto semplice.Consigliatissimo.
jmoonx14
Reviewed in the United States on September 16, 2015
My Trek hybrid only has 600 miles on it and I am planning a short tour (5 days/200 miles) in October. I knew I needed a spare chain for the ride and I ordered one at the same time as I got this tool. I got this little simple Park Tool gauge in yesterday which I got for a lifetime of biking as I always needed one. I previously used the eyeball/measuring method which does work but this tool is very accurate and gives one a 'feel' for the chain with the dual measurements that it provides.So when I got it in I gauged my chain on the lower tensioned side and low and behold the .5% side fell right in. The .75% was very close to doing the same. I was a bit taken aback with the low miles on the chain that it was already this stretched. It was still within tolerances but it was close. The chain was a Shimano and it was the original. I maintain my bikes and clean/lube the chains on a regular basis and use wet ceramic Pro lube. It was what it was though and I verified with the measure method...almost 1/16" stretch in a 12" run. Time for a new chain.So as soon as the new chain came in it went on the bike. Now the original Shimano is fitted with a master link and will be the spare for my upcoming trip. As a confirmation of this tool I gauged the new chain on the bike under tension and the .5% isn't even close to going in. I checked my daughters chain and she is in good shape. This gauge is quick, light, handy and accurate. Get one and measure often because a stretched chain will wear your cassette and chainring teeth which will cost you big in the long run. This is especially true for those of us who ride in remote locations and find ourselves far from home while depending on the bike to get us back home or somewhere to else shelter.Highly recommended for cyclists.
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