Gates Carbon Drive CDX Belt to be used with Centertrack-Sprockets.The technology behind Gates Carbon Drive is rooted in high horsepower motorcycles and dragsters. Now, this high performance technology has been perfected for a wide variety of bicycles. At the core of the drive is the CenterTrack belt. Custom made, this 12-mm pitch, carbon-fiber belt is stronger than and as efficient as a traditional bike chain. The drive is completed with innovative sprocket designs and your choice of internally-geared or single-speed hub. The patented Gates Carbon Drive gives you a longer-lasting, lower-maintenance drive, and most importantly, an unbelievably awesome ride.DURABILITY & HANDLING CHARACTERISTICS: No chain grease More durable and lasts longer than metal chain Weighs less than a traditional chain Smooth and quiet ride COMPATABILITY & AVAILABILITY Available on more than 200 bikes Works with road bikes, mountain bikes and even tandem bikes Compatible with single-speed or internally-geared hub Geared hubs are available from well-known manufacturers Belt drive compatible frame required Gates Carbon Drive Belt Calculator Belt tension meter app for iPhone Belt tension meter app for Android