Posted on 23rd, February 2013 about XCR BB Mount Chainguide
Great guide for the money and simple to install & set up. As others have metnioned, the chain can drop on 9-speed setups but as far as I can tell this only happens when the chain is forced sideways - most notably when scandinavian flicking it into harpins. Can't recall dropping a chain due to rough terrain though. Bottom line is that if you don't ride too exuberantly then this is a bargain and won't let you down.