Originally Posted by
Bill Kapaun
My point was to calibrate your checker from experience.I now know that IF my checker "just fits", that my chain is worn .25%. NOT .5%.
Some day I'll learn what the .75% mark really means. Maybe .5%?
Read the manual. From the Park Tool website on the CC-3.2 Chain Checker:
For 9 and 10-speed chains, replace chain just as the gauge fits the 0.75% side fits flat into the chain. For 11 and 12-speed chain, replace as the 0.5% side fits.