absoluteBLACK Premium 1X Cyclocross 110/5 bcd oval chainrings are designed for all Shimano 5 bolt cranks like Dura-Ace 7950, Ultegra 6750, Shimano 105- 5750 and many more. Perfect choice for Cyclocross and Gravel 1X setup with road cranks. Eagle 12spd compatible, narrow-wide chainring. Delivered with mounting bolts.Size (Weight):38T (63g)40T (68.5g)42T (76g)Compatibility: Shimano Dura-Ace 7950, Ultegra 6750, Shimano 105- 5750, Tiagra 4650, FSA, Rotor 3D & 3D+, S-works and many older cranks. Fits Sram Force and Red. Also fits Sram cranks that have 1 hidden chainring bolt like Force22, Red22. Compatible with Di2.Material: cnc machined 7075 Txxx Aluminum. Long-lasting constructionFitment: 110 BCD x 5