11

Compatible with Ultra-Shift chains Nickel-chrome finish on steel cogs Resists torsion 180% more than Ultra-Drive cassettes 3 titanium cogs

Ultegra The 5 largest cogs are mounted on 2 aluminum and composite spiders Lightweight and high performance Aluminum locknut Fini plaqué nickel Compatible with 10- and 11-speed cassette bodies (for 11-speed, use a 1.85 mm spacer)  Other sizes are only compatible with 11-speed road hubs

Power Glide technology Acier traité thermiquement Compatibility: PC-1170, PC-1190R, and other 11-speed chains.