CeramicSpeed OSPW System - LTD - Gold EditionPrepare to change the way you ride forever with this revolutionary Oversized Pulley Wheel System ("OSPW"), the CeramicSpeed OSPW System - LTD - Gold Edition. With watt savings starting at 2.4w, you can banish the preconception that you can't buy speed!Every aspect of this CeramicSpeed OSPW System - LTD - Gold Edition has been painstakingly poured over by a dedicated R&D Team to ensure the highest quality materials have been sourced. From the bearings to the cage, you will receive the crème de la crème of advanced technology. If it's good enough for professional teams like Quick-Step Floors and Team Dimension Data for Qhubeka, and the national Danish Track Cycling team, you know optimal performance is guaranteed More power, less friction, and increased durabilityThis CeramicSpeed OSPW System - LTD - Gold Edition comes with two 17-tooth aluminium pulley wheels which are fitted with CeramicSpeed bearings. If you're interested in tangibles, here's the net result: friction is stripped to the bare minimum whilst overall power savings come in at a whopping 60%. Some users experienced higher savings but a baseline saving of 60% is definitely worth getting excited about. In race terms, that's a lot of horsepower in the tank to launch a winning solo attack or snatch a bunch sprint victory. CeramicSpeed's use of advanced materials means that this OSPW System - LTD - Gold Edition has a lifetime that is some three-to-five times longer than a traditional standard pulley system. This means you can enjoy buttery-smooth shifting, reduced friction, and power savings for the foreseeable future Features:Material: Carbon/PA Cage, Aluminium Pulley WheelsCompatibility: Ultegra/Dura Ace (6800/7800/7900/7970/9000/9070), 10-speed and 11-speed, electronic and mechanical groupsets Less frictionSmoothHuge overall power savingsWeight: 55gMaintenanceIt is important that you properly lubricate your bearings in order to ensure optimal performance and maximum longevity. Add oil to the outside of the bearing seal, so that oil can penetrate the bearing. Do this when you lubricate your chain, or if you have washed your bike or have been riding in wet or muddy conditions Important: When travelling, please remember to dismount your entire rear derailleur with an Allen key. The OSPW System will not fit in most bike travel bags and could be damaged if left on Buy CeramicSpeed Components from Chain Reaction Cycles, the World's Largest Online Bike Store.