• Shimano Dura Ace FC-7900 10-Speed 39T-B SG-X Inner Chainring to fit 130BCD 5-Hole Cranks. New In Box.
• Mates with 52T-B and 53T-B rings.
• 130bcd, will work with 9/10-spd systems.
• Alloy and made in Japan quality from 2010.
• CR5181.
• FREE shipping in the USA.