CeramicSpeed Coated OSPW System Shimano Dura Ace 9250/Ultegra 8150 - Black is your ultimate solution to achieve efficient and smooth gearing performance. The OSPW system features carbon polyamide cages, oversized pulleys with ceramic bearings that offer a longer lifespan than the standard pulleys.Installation is made easy with the integrated stop tower. The top pulley features 13 teeth, while the bottom pulley has 19 teeth. The product comes with CeramicSpeed oil, making it a complete package. The OSPW system not only improves the gear performance, but its overall energy savings reach up to 30%-60%. The Shimano Dura Ace 9250/Ultegra 8150's compatibility and the OSPW system's smooth and effortless functioning make it a top choice among cyclists. Whether you're a road cyclist or someone who enjoys off-road riding, the OSPW system is perfect for you. Upgrade your ride and take your performance to the next level with the CeramicSpeed Coated OSPW System. Componentes, Cambios, Cambiostraseros.