Originally Posted by
cudak888
Over 100 bikes? This fellow is not in Miami, is he?
P.S.: It's a Trek 728/720. 720 if purchased originally as a frameset, 728 if bought built-up.
-Kurt
Kurt - the 72* would have cantilever brakes. This one doesn't look to have those.
The BB looks quite a bit like the investment cast one that is on top of the line models (at least in 1984) on the 760, 770 and 170. (My '84 has that). Of course if it's a different year, it could be a different model - but not a 72*.
OP - they really didn't make very many without serial numbers. Get it really clean and look hard in good light. It can be tricky to find.
Did a bit more poking around through the Trek brochures. The 520 was made with that same bottom bracket starting in 1986. If the cable routes through the chain stay, this - along with the somewhat more relaxed-looking geometry would seem more likely than it being one of the 1984-ish racing models.