The CeramicSpeed oversized pulley wheel system has been designed to optimise performance, with a minimum energy saving of 2.4 watts. The revolutionary OSPW system has been designed, produced and hand-assembled in Denmark in regular ventilation situations and isolated from any type of contaminated material and is inspected four times throughout the production process to make sure that all components are perfectly combined. This "Plug and Play" product is the result of a lengthy development process and has been designed for optimum performance. Made to respond to the need of a transmission with reduced friction (up to 60%) and that is quicker and more efficient. The OSPW system will help you ride any distance more comfortably. The CeramicSpeed OSPW system is designed to optimise performance and save watts, thanks to their extremely low friction bearings and 17-teeth oversized pulleys. This increased pulley size ensures less chain bending and therefore reduced friction. Optimise your transmission with this oversized pulley wheel system by CeramicSpeed and experience the industry-leading efficiency. The use of high-quality materials makes this a system that will out-last other commonly-used pulleys on the market.