The cable length is stamped on the jacket near one end. The length is in inches so divide by 12 to order in feet. Also please check out the package deals. Many times you can order a cable / helm package for the same money or even less than a single cable. Don't ask why, I don't know why : ) But the fact is that helms wear out just like cables. The more stiff your old cable gets, the more wear your helm is enduring. You don't have to change it, I just thought Id share some info.