This tool quickly checks chain stretch and wear it will determine if a chain is good or bad.
A worn bicycle chain can cause poor shifting and in time can even cause excessive wear to the derailleur and rear cogs, causing a much more expensive problem. That's why bike component manufacturers recommend chain replacement at regular wear intervals.
Simply insert the Chain Checker's pins into two links, lightly press the swing arm gauge, and then check the gauge window for an accurate reading.
The chain checker is suitable for most single-speed and derailleur chains*, including Shimano XTR 12-speed chains.
5-to-10-speed chains: replace chain at or just before the 0.75% reading. 11-to-12-speed chains: replace at ≥ 0.5%. Single-speed chains: replace at ≥ 1%.
Description
PRODUCT SPECIFICATION
Name: Bicycle Chain Checker
Application Range: Suitable for most bike chains
Size: 136*29*23mm
Weight: 40.4g(1.43oz)
Color: Black + Blue
Material: High Strength Aluminum Alloy
How To Use: As shown in the picture or with instructions included in the package