Ospw shimano 10 + 11s (ultegra + dura ace) alloy black

Developed and designed entirely by CeramicSpeed, the Oversized Pulley Wheel System (OSPW) for Shimano 9000/6700 provides the ultimate optimization of your bike's drivetrain. This OSPW system features a set of 17 tooth aluminum pulley wheels, available in red and black, housed in a specially designed carbon and polyamide cage. The 17 tooth upper and lower oversized aluminum pulley wheels come equipped with standard or coated CeramicSpeed ​​bearings. The Oversized Pulley Wheel (OSPW) system is the product of choice for many of the world's leading cycling teams and triathletes. This specific system is compatible with Ultegra 6700/6770/6800/6870 mechanical and Di2 rear derailleurs and Dura Ace 7900/7970/9000/9070 mechanical and Di2 rear derailleurs. The system is compatible with a 28 tooth cassette on most bikes, depending on the suspension of the derailleur.