This guide is the lower only configuration of our chain guide. It is intended for bikes that don't have the space or need to run an upper guide. Our patent pending guide geometry makes it impossible for the chain to get dropped from the bottom of your chainring all while being entire non-contact so that you don't have to worry about it holding you back on climbs. That's all on top of it being quite light and stout enough to take some serious impacts. We have cased things to rock on the guard and ridden out of it with little to show. Wouldn't recommend trying that one though.