Shimano Dura-Ace NJS Track Fixed Gear Chainring 49T 144 BCD Mint Japan
NJS Certified: Approved for professional Japanese Keirin racing. Model: Dura-Ace (NJS Certified). Engravings: "SHIMANO", "Dura-Ace", "NJS", "49", and Date Code are clearly visible. Teeth: 49T (1/8” Thick / Atsu-ba).