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The CC-4 provides measurements at the two most common wear intervals recommended for chain replacement on multi-speed bicycles:
- <0.5% Wear - acceptable on all derailleur and single-speed drivetrains.
- ≥0.5% Wear - 11-to-12-speed chains should be replaced at or before this measurement
- ≥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.
Rui Marques
Reviewed in Sweden on September 7, 2024
Parktool tools are flawless, and that one in particular is not much more expensive than it's counterparts.
M. Broome
Reviewed in the United States on August 6, 2024
I recently bought the Park CC4 chain wear indicator as it works on all bike chains including 12 speed chains. Super easy to use. Replacing your chain often is key to drive train maintenance. Much cheaper to replace a chain than cassettes and chain rings.
John Gtz
Reviewed in the United States on August 31, 2024
This tool is more of a go/no go tool. It is a little more robust than my higher end tool also by Park. Park makes the best bicycle tools.
Txingudi
Reviewed in Spain on August 24, 2024
La herramienta es de buena calidad ... Recomendable ..
Doug
Reviewed in the United States on August 20, 2024
Very simple, but accurate, stainless steel construction. No moving parts.
Paul SBR
Reviewed in the United States on August 16, 2024
It is a very simple but quick way to check your chain for wear. I bought it and checked my chain, it was just at the end of it's useful life. So I replaced it and the shifting is now perfect again. I checked the new chain with this tool and saw the difference - nice!
DutchTouch1
Reviewed in the United States on May 17, 2024
Stop guessing. This chain wear checker is so simple and quick, that it becomes easy to regularly check your chain for wear. Place it on, squeeze and drop it down. Exactly what's needed to maintain our bikes efficiently and cost-effectively. Thank you, Park Tool and thank you, Amazon, for the super-quick delivery.
Andrew S
Reviewed in Australia on February 10, 2024
Easy way to see chain wear if the end point slips into the chain linkage. Keep your chain clean and lubricated and it will last much longer. An overly oily chain attracts dust and forms a paste that wears out your chain faster and will cost you money to replace.
Strupi
Reviewed in Germany on October 3, 2024
Gute Qualität!
Sisophous
Reviewed in the United States on October 24, 2024
Now I can tell when my chain needs replacement. I no longer have to rely on my bike shop to tell me. It takes less than 2 seconds to see whether your chain needs replacement. For 11 and 12 speed chains, replace after .5% wear. For 10 speed chains, replace after .75% wear. Just snap onto the upper or lower chain section and see where the opposite end winds up. The video provided is excellent.
Vic R
Reviewed in the United States on April 16, 2024
The Park Tool CC-4 Chain Wear Indicator is an indispensable tool for any cyclist looking to maintain their bike in tip-top condition. This little gadget is incredibly easy to use and provides a quick, accurate measure of chain wear, helping you decide whether it's time for a replacement before you suffer a mid-ride breakdown. The build quality is solid, typical of Park Tool's high standards, ensuring that this tool can withstand being tossed around in your tool kit without a problem. It’s a simple, yet effective way to extend the life of your drivetrain components by ensuring you never ride on a worn-out chain. For anyone serious about bicycle maintenance, this tool is a must-have. A small investment to keep your bike running smoothly and efficiently!
Cliente Kindle
Reviewed in Italy on January 8, 2023
Ottimo strumento
Markh
Reviewed in the United States on January 2, 2023
I ride bikes a lot, but never considered how important the chain was. Now it is easy to check my chains on all my bicycles to see if the chain needs replacement. If you are having a stretched chain on your bicycle too long it will damage the chain rings and other components making you bike shift not so good. Easy to use and you can trust the great products from Park Tool. Well made and a great part of your bicycle maintenance program.
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