• Also for this particular frameset:

    From TREK in 1984:

    Reynolds 531CS (Club Sport) frame tubing is first used by Trek.

    According to Terry at Reynolds-Cycle.com: "531CS was a special set, supplied mainly to Trek. The main triangle was butted 531 and the rear stays were CrMo (501)." The fork was taper gauge CrMo (501). (Info. provided by Dickey Greer.)

    From a forum somewhere. Didn't know that.

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