As the fastest oversized pulley wheel system on the market, the CeramicSpeed Oversized Pulley Wheel System (OSPW System) has been developed to answer the increasing demand for improved drivetrain performance. The OSPW System optimises the overall efficiency of your drivetrain thanks to the extremely low friction of the CeramicSpeed Bearings and the unique design of the overall system. CeramicSpeed OSPW Systems will make you save watts and improve your performance in both indoor and outdoor training and racing. Upgrade your hometrainer with the watt-saving OSPW Systems and feel the difference immediately. Ride faster with CeramicSpeed in Zwift and other indoor training apps. The CeramicSpeed Oversized Pulley Wheels System has been proven to be the fastest pulley system in the world. This system for SRAM features two oversized 17-tooth aluminium pulley wheels, available in red or black, of which are housed within a robust cage crafted from a compound of polyamide (PA) and carbon fibre. This specific SRAM Mechanical version of the Oversized Pulley Wheel System is only compatible with the following mechanical rear derailleurs: SRAM Red and SRAM Force - 10 and 11 speed. The OSPW system for SRAM mechanical derailluers is compatible with both short cage & WiFli derailleur bodies. The OSPW System for SRAM fits up to 32-tooth cassettes. In the Box: Complete OSPW System CeramicSpeed Pulley Oil, 15 ml. dropper bottle The Story CeramicSpeed is one of the world’s leading suppliers of ceramic bearings. The company consists of two specialised sales channels, focusing on cycling and industrial applications. We have more than 15 years of experience in bearings applications, and we have developed close relationships with our component suppliers over the time – each of whom is the very best in their fields. The CeramicSpeed Sports channel delivers both bearings as well as ultrafast racing chains, reinforcing the company’s goal of saving watts and delivering the lowest friction available. All our bearings are handmade and our chains are optimised by hand in Denmark.