Chain Wear Indicator

Chain wear is often invisible to the naked eye, but as a chain stretches, it acts like a saw that grinds down your cassette and chainrings. Using this tool allows you to replace just the chain before the damage spreads to more expensive drivetrain components.

Yes, the Unior indicator is universally compatible with all bicycle chain types, including modern 11-speed, 12-speed, and e-bike specific chains.

The 0.7% mark indicates the chain is worn enough to warrant replacement to save your cassette. The 1.2% mark indicates the chain is severely worn and you will likely need to replace both the chain and the cassette, as the drivetrain is now compromised.

For the average rider, checking your chain every 500 to 1,000 miles is a good rule of thumb. If you ride in wet, muddy, or gritty conditions, you should check it more frequently, as abrasive debris accelerates wear significantly.

Simply insert the fixed end into the chain links and then drop the other end into the chain. Apply gentle pressure to the tool; if the gauge drops completely into the links, your chain has reached that specific wear threshold.