For what its worth thr original components on the bike were early Shimano Dura Ace. The only difference between the two years is the 1977s the rear derailluer was called Crane and by 1978 they relabled it Dura Ace. All the other components say Dura Ace on them. I have a red one in the basement and it rides every bit as good as my 1974 Paramount P10-9. They were truly an excellant bike for the money. Roger