2x9/10/11sp|~|4x110mm|~|36T|~|black|~| - Inner and outer oval chainrings are optimized with smooth shifting in mind - Features smooth angled surfaces, (6) up-shifting ramps (outer ring), and (12) down-shifting points (outer ring) - Oval rings help the rider spin smoother and generate more power - Example: 32t is equivalent to 30t at deadspot and 34t at the power zone - Works with 2x chainring systems and do not require any modification to the front derailleur for use - Compatibility: Shimano Dura-Ace 9100 and Ultegra 8000 but will also fit DA9000/Ultegra 6800 - Designed in UK, manufactured in Poland