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Developed and designed entirely by CeramicSpeed, the Oversized Pulley Wheel (OSPW) System for Shimano 9000/6800 provides the ultimate optimization of your bicycle's drivetrain. This OSPW System features a set of 17-tooth aluminum Pulley Wheels housed in a specially designed polyamide (PA) and carbon cage. The upper and lower 17-tooth oversized aluminum pulley wheels come fitted with either standard or coated CeramicSpeed Bearings. The Oversized Pulley Wheel (OSPW) System is the product of choice by 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. It is not compatible with Shimano Dura-Ace 9100/9150 and Ultegra 8000 series rear derailleurs. For those rear derailleurs you will need a OSPW System for Shimano 9100 series. The system is compatible with up to a 28-tooth cassette on most bikes, depending on derailleur hanger. The typical overall power savings of the OSPW System for Shimano 9000/6800 is 30%-60% over a stock setup, and the oversized pulley wheels have a lifespan that is 3-5 times longer than the commonly used standard pulleys on the market. In The Box: - A complete 17-tooth OSPW System - CeramicSpeed bearing oil in 15ml dropper bottle

Pulley wheels that reduce friction, last 3-5 times longer than stock high-end pulleys, and reduce overall drag within the drivetrain. - Grade 3 Silicone Nitride balls - Hand-built in Denmark - Machined aluminum pulleys - Hardened races In the box: - 2 x 11-tooth pulley wheels - CeramicSpeed bearing oil in 15ml dropper bottle - Sticker sheet

Improve the performance of your 11-speed Shimano rear derailleur with pulleys that reduce friction and increase bearing life. Ours are designed to work with less drag, adding to the power transmitted to the rear wheel. - Uses low-drag, long-life Standard Bearing with hardened-steel races and our super-round CeramicSpeed balls. - A set consists of differing upper and lower pulleys: they are marked as such and have directional arrows etched on them so you know exactly how to install them. - These pulleys are compatible with all Shimano 11-speed rear derailleurs except XT or XTR. - The kits come with CeramicSpeed oil in a 15ml dropper bottle. The bearings come pre-oiled. In the box: - 2 x 11-tooth pulley wheels - 4 x spacers - CeramicSpeed Bearing Oil in 15 ml dropper bottle - Sticker sheet