absoluteBLACK Premium Oval Road 50T Shimano 9100/8000 Black

Compatibility: Shimano Dura-Ace 9100, R9120, R9150 & R9170 Di2 and Ultegra 8000, R8020, R8050 & 8070 Di2, 105- R7000, R7020, R7070. They can also retrofit all 9000 and 6800 series cranks but use bolt covers for best appearance. 10 / 11 / 12sp compatible- For outer chainring please order "long bolts" from us OR bolt covers. Changing inner chainring to oval only? use original bolts- 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- Designed in UK, manufactured in Poland