Gates CDX CenterTrack Belt - 168T - Rusty, high-maintenance chain drives are a thing of the past thanks to the quiet, long-lasting - Carbon Drive Beltsfrom Perfect for mountain bikes, urban commuters, or even e-bikes, theGatesCarbonsystems are among the most revolutionary drivetrain part to hit the market in recent memory. Once set up, the - Carbon Drivesystem requires little to no ongoing maintenance outside of checking the belt tension occasionally.TheGates Carbon Drive Beltswere created to meet the needs of the most demanding cyclists. Made using durable, weather-resistance polyurethane exterior, these belts feature stretch free carbon fiber tensile cords. If you hopon your bike and expect it to just work, then you need aCarbonDrivesystem fromGates.CDX CenterTrack Belt168TMade using Carbin Fiber Tensile Cords - Fully weather resistant designLong-lastingA mobile app can help with tensioning