Dura-Ace 7800
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Features: Replacement or upgrade chainrings Dura Ace 10-Speed systems SG-X Chainrings in standard 50 52 53T or Triathlon Specific 54 55 56T. Machined alloy chainring. These are Type A chainrings. Please be aware that Outer & Inner chainrings need to be paired up. Use only type A outer with type A inner ring (likewise for type B) these rings are for double only. If picking Triathlon spec outer rings please purchase triathlon spec inner ring Also note the maximum capacity of your front derailleur. BCD: 130mm 5 bolt pattern.