Premium absoluteBLACK Gravel / Road oval chainrings in Subcompact 110/4bcd sizes for improved climbing and gravel terrain riding. Now you can go anywhere and climb everything. Alpine climbs will never be that difficult anymore. Chainrings are compatible with: Dura-Ace 9100, R9150 Di2, Ultegra 8000, R8050 Di2, Dura-Ace 9000, Ultegra 6800, Shimano 105 - 5800, Tiagra 4700. absoluteBLACK is the only company on the market making 46/30 and 48/32 chainring combinations which fits 110/4 Shimano cranks. Its patent pending solution solves a long felt need for such chainring sizes in modern 110/4bcd cranks. IMPORTANT Due to very special offset construction and custom bolts: *30T can only work with 46T and special bolt set 46/30. (bolts included with small ring) *32T can only work with 48T and special bolt set 48/32. (bolts included with small ring) No other combination or mix will work. No bolt covers. We Only recommend Dura-ace 11spd chain or Sram Eagle 12spd chain for enhanced clearance of the small ring.