the Fern’s 27

1x12-speed RD-M6100-SGS

Aluminium/Plastic

Who's this for: Riders wanting a stem that's as tough as they can get it

Park CC-4 Chain Wear Indicator Tool PDP|Colour the Fern’s 27A worn chain will make your gears shift poorly, create more noise, and wear your cassette and chainrings out more quickly. The Park Tool CC 4 Chain Checker will let you know when it's time to replace your chain so that you can keep your drivetrain running sweet and save some money on replacement parts. Who's this item for: Anybody who wants to keep their bike's drivetrain running smoothly. Chain compatibility: Works with 5 to 12 speed chains. How does