Improve drive train speed and tension accuracy over other aftermarket rollers. Superior replacement Powerlip roller compared to stock component. Low friction material lowers drag without transferring heat. Patented Powerlip™ design makes the chain run fast and true. Sealed bearings are ABEC and 9002 ISO rated for superior rolling and long life. New specific fit hardware is included. Race tested size and width for each model fitment. This is a single lower roller, not a pair. Note: This is NOT a universal roller.