That sounds about right. At one time, someone mentioned to me the full gamut of frame design intentions/fame number combinations, but as my geared interests are almost totally in either fully bagged tourers or high speed fast handling racing bikes, the x20 and x60 series are the only ones I remember. x00 were either generic, or (more likely) marketed as a somewhat comfort oriented sport tourer.
I'll probably figure out more as I dig up more frames. I've got a GREAT deal of respect for those 80's Trek's.
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Syke
“No one in this world, so far as I know — and I have searched the records for years, and employed agents to help me — has ever lost money by underestimating the intelligence of the great masses of the plain people. Nor has anyone ever lost public office thereby.”
H.L. Mencken, (1926)