Low friction material lowers drag without transferring heat. Superior replacement Powerlip roller compared to stock component. Improve drive train speed and tension accuracy over other aftermarket rollers. Exclusive Powerlip™ design makes the chain run fast and true. Sealed bearings are ABEC and 9002 ISO rated for superior rolling and long life. Includes new bike specific hardware. Race tested size and width for each model fitment. Unconditional one-year manufacturer's free replacement guarantee. Sold individually.