Shimano TL-CN42 Chain Wear Indicator Tool YGroup_7033613680685 If using a 9-speed drivetrain

If using a 9-speed drivetrain use a 10-speed chain (shifts and works well on a 9-speed drivetrain and fits the ring tighter for better chain retention)

•Lightweight O Matter frame material with ellipse metal icon accents

Things you can carry: Designed with maximum storage in mind

Removable protective inserts for washing: No

the DS-1 is a must have scale for any rider who needs to weigh their ride

Shimano TL-CN42 Chain Wear Indicator Tool YGroup_7033613680685 If using a 9-speed drivetrainThe Shimano TL CN42 Chain Wear Indicator Tool is a must have in your tool box. This tool is easy to use and understand so there'll be no question when your chain is due for replacement. Who's this item for: Workshop mechanics and home enthusiasts. Chain compatibility: This will work with 7 12 speed chains. How does it work: There are pictograph instruction on the side of the TL CN42. The two steps are as follows: Drop the 'split section' labeled with