• Genuine Dura-Ace track lock ring
• NJS approved
• High quality steel
• 1.29" x 24 TPI left-hand thread
• Fits most fixed gear/track hubs
• Genuine Dura-Ace track lock ring
• NJS approved
• High quality steel
• 1.29" x 24 TPI left-hand thread
• Fits most fixed gear/track hubs