This is a Shimano 105 Series FC-5800L outer 11-Speed Compact Chainring with 50 Tooth count and 110mm bolt diameter in black finish. For 50/34 compact chain ring combinations.
Bolt Pattern: 4-Bolt Asymetrical
Chainring BCD: 110mm
Chain Compatibility: 11-speed/double
This product is expected to become available for purchase on Thursday, September 16, 2021