Round chainrings for nonhidden bolt 5x110BCD cranks Features (6) upshifting ramps (outer ring) and (12) downshifting points (outer ring) Compatibility: Shimano DuraAce 7950, Ultegra 6750, Shimano 105 5750, Tiagra 4650, FSA, Praxis, Rotor 3D & 3D+, Sworks and many more 5 bolt cranks. Also fits SRAM Force and Red but NOT compatible with SRAM cranks that have 1 hidden chainring bolt (Force22, Red22) Compatible with Di2. 10 / 11 / 12sp compatible For outer chainring please order long bolts. Changing inner chainring only? Use original bolts Designed in UK, manufactured in Poland