Chain Guide Model 2 for Mountiain Bike Chain Drops 1x 2X 3X Drive Chains Mountain Bike Tensioner Custom DesignDesigned to work with Multi Speed 1x 2x 3x Drive Chains Front (not for fixed gear single speed bikes). It helps prevent chain drops and chain slap on your bike or mountain bike. It will work with most bike on the market. This is a 3D print..