• New, rare, unused Shimano Dura Ace 10-Pitch 10mm FC-7000 Track 49T 10mm x 1/8" chainring. 
• 49-teeth, alloy and made in Japan quality.
• Made from 1976 to 1986.
• 65 grams/2.3oz. Shorter chain links equal less weight.
• CRT008.
• FREE shipping in the USA.