Premium Oval Road Chainring, 4x110BCD 50T - Black

- Shimano Dura-Ace 9000, Ultegra 6800, Shimano 105 5800, Tiagra 4700. Compatible with Di2 & Pioneer, SRM and other power meters\n- Inner and outer oval chainrings are optimized with smooth shifting in mind\n- Features smooth angled surfaces, (6) up-shifting ramps (outer ring), and (12) down-shifting points (outer ring)\n- Oval rings help the rider to spin smoother and more efficiently\n- Example: 32t is equivalent to 30t at dead spot and 34t at the power zone\n- Works with 2x chainring systems and does not require any modification to the front derailleur for use\n- Designed in UK, manufactured in Poland\n- Third party online retailers must be preapproved by manufacturer