I wore completely thru my rear chain guide so I needed to replace it. The stock guide cost $16 but GF only had the whole assembly, therefore for about the same $ i got the TM Designs factory edition. It was an easy replacement, bolted right up in a couple of minutes. It does hang down a bit lower the the original but i can't imagine wearing this thing out. On the 2011 and newer bikes it is a direct install but on the older models there is a bracket that must be purchase also. I like it.