SHIMANO TL CN42 Chain Wear Monitor

Very easy to use, this chain wear indicator TL CN42 from SHIMANO allows you to see the condition of your links at a glance.

Ideal for keeping an eye on your drivetrain and changing your equipment before any breakage, which can be a real nuisance in the middle of a ride and sometimes damaging to your derailleurs!

What's more, it's got instructions written all over it!

Ref: 9223832961373