Specifically the dewlie.......the two ring guide although this may be an issue with the single ringers as well. So there's a backplate, a roller and a bash guard just like every other chainguide. But the roller has a bearing on only one side. Meaning getting the thing tight binds the roller making it a roller that won't roll. WTF? I've been doing this bike mechanic thing for quite a while including the endless mrp modifications necessary for so many years and my intuition is to call blackspire and lambast them utter stupidity. Which is why I now apeal to those of you who might have these things to lambast me for mine. And don't fill this with "buy a drs" "get an lrp". I own the thing, it's sitting in my garage and I'm willing to bet there's just something simple I'm not seeing. Please show me that thing. Thanks.