No better way to bring a ride to an end then to have your rear derailleur cable break. If the ride is flat you will jyou can get home, but if there are hills to climb, your ride is probably over. It is not difficult to replace your shift cables if the cable hasn't frayed and broken in the shifter, it will be a good time to take your bike to your LBS because it will take some repair knowledge to pull the frayed cable out. Like I say, easy fix if it hasn't broken. I use the cable with my Shimano components.