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The CC-4.2 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
- ≥1.0% Wear - chains on single-speed and two-sprocket systems 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.
theboot
Reviewed in the United States on March 11, 2025
A necessity nowadays since we've got SRAM and others doing weird things with their chains so that the old school chain checkers that measured from the left face of one roller to the right face of another don't give accurate readings anymore.
Customer
Reviewed in Canada on February 4, 2025
A simple gauge to check bicycle chain wear, as a “peace of mind” tool!
William Van Hillo
Reviewed in the United States on February 22, 2025
This tool from Park works exactly like it should heavy duty metal design should last you a lifetime if you take care of it.
Kinte
Reviewed in the United States on February 19, 2025
Campgnolo says in the manual to use a micrometer to test the chain length of 6 links in a few spots @ max 132.6mm or replace the chain. The micrometer I have works for this but using this Park Tool device is easier. For me, the Campy 13sp chain does need replacement @ =0.5 detent using this device, as the chain starts creaking there even though technically it’s OK since it measures 132.0mm when the 0.5 detent is reached.
Mscalifornia
Reviewed in the United States on February 12, 2025
Easy to use, dead accurate, saves a ton of $$ on chain replacement.
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