Chain Wear Indicator Tool

£15

A chain wear indicator tool measures chain elongation in seconds, telling you exactly when to replace your chain before it starts accelerating wear on your cassette and chainring — parts that cost considerably more to replace than the chain itself if left too long. This is especially relevant on an eMTB, where motor-assisted torque puts more sustained load through the drivetrain than an unassisted bike, meaning chains typically wear faster and are worth checking more regularly than you might expect. A genuinely inexpensive tool that can save a meaningful amount in avoided cassette and chainring replacements over the working life of your bike, and takes seconds to use once you're in the habit of checking.