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Seven now offers a greaseless belt drive system as an alternative option for Singlespeed bikes.
The Carbon Drive™ System uses a carbon reinforced polyurethane belt in place of a metal chain. The single piece belt has the necessary tensile strength and high modulus to provide a smooth, clean, and long lasting ride experience. This type of system can be used on either road or mountain bikes.
Technology has been in use with motorcycles for 25 years
Clean, quiet, smooth running action
Sprocket design sheds mud, snow, and other debris
No lubrication required; just get on and ride
Lifespan of a Carbon Drive belt is longer than a conventional chain
The price of this option is $225. This includes only the bolt-on junction at the dropout and seat stay. This option must be used with a track dropout, an eccentric bottom bracket, or slider dropout to correctly tension the belt. Carbon Drive™ belt and components are not included in the price.