Shimano Dura-Ace SS-7600 16T NJS Track Cog 1/8″ Fixed Gear Sprocket Y27916100
Cog Teeth: 16T. Speed: Single-Speed / Fixed Gear. ✚ Absolute great bike! It was as described and more! More than good value. Great value! Fully functional and in good working condition. The quality of the bike itself was A+ and in great shape.