The CC-4 is a drop-in style gauge that measures bicycle chain wear.The laser cut CC-4 accurately measures a long section of chain and strategically comes in contact with the chain in three places, quickly and easily taking the guesswork out of knowing when chain replacement is necessary.A worn chain will cause poor shifting as well as accelerate drivetrain wear.The CC-4 works on any 5 to 12-speed derailleur chain (including SRAM AXS) and is designed to accurately indicate when a chain reaches .5% and .75% wear, the points at which most chain manufacturers suggest replacement.Made in the USA and covered by Park Tool’s legendary limited lifetime warranty.
Sherlock –
Simple to use. Worth watching the YouTube instructions. I have the benefit of testing on a new and a variety of worn chains. I did a comparison via ruler measuring of the same chains and came up with the same results. I can confirm via this method that it works accurately and well. It takes a lot less time than the ruler method and is probably more reliable (I repeated the ruler method 4 times to get a reliable average result…too much faffing around!).
Fred_Hyper –
A chain checking tool is an essential part of your bike tool set, particularly if you have a crank driven e-bike.Once you work out how to use it does what it need to do.Usual Park Tool quality, probably a bit expensive for what it is, but will easily pay for itself in the long term.
Housewife –
For my son he wanted it. Must work he hasn’t complained
Dizzle –
Necessary tool to have but is a bit expensive for a piece of pressed metal.
Hannah –
The tool is high quality make and seems to be very accurate. However, it’s a bit pricey.