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 to spin smoother and more efficiently- Example: 32t is equivalent to 30t at dead spot and 34t at the power zone- Works with 2x chainring systems and does not require any modification to the front derailleur for use- Compatibility: SRAM cranks that have (1) hidden chainring bolt (Force22, Red22)- Designed in UK, manufactured in Poland