The one by (1x) generation started with DH bikes, but there were always issues with the chain falling off the chain ring in rough conditions. Chain guides were created to keep the chain spinning on the drive train. Funn may not have invented the Chain Guide but we have spent a lot of time perfecting it. We have a Zippa guide to fit your one by (1x) world. If you are running a one by (1x) system on your XC bike we have a guide that will work for you. The same can be said for any other bike that you have in your garage.