Shimano CA70 Inline Gear Cable Adjuster Replacing a section of your existing gear cable housing with this adjuster makes it easy to fine tune cable tension to ensure perfect gear indexing. Especially recommended for front mech cables, which rarely have a cable adjustment features. Also useful if your old rear mech's barrel adjuster has seized. Inline alloy barrel adjuster for fine tuning gear set up. High grade barrel adjuster can be installed inline on SP41 gear cable to allow fine adjustment of gear indexing.