Ratio 12 speed upgrade - cable brake shifter ratchet replacement

NOTE: On some older shifters, the reach adjuster will not spin freely when it bottoms out. Stop turning the reach adjuster screw as soon as you encounter resistance. This video shows you how to fit a 12 speed Ratio shifter ratchet to your Sram™ 11 speed shifter for cable brakes. If you have a shifter for hydraulic brakes, please use this video: To fit your Ratio cable fin to a derailleur, see this video: