Fantastic work with this, JEIRVINE! Very happy to see it turned out so well.
Another data point from my 1979 Trek 930 frame, still yet to be built up:
rear spacing is 123mm. Drop-outs checked and were in alignment at this spacing. The frame arrived in my hands well-used/abused, so I can't speak to its original specs, but 123 makes sense as halfway between the then viable choices of 120 and 126, much like the compromise spacing of 128 that would follow, or 132.5 now.
My seatpost bolt is non-standard, but a very basic multi-tool has the appropriate allen key, making me think it must likely be 5 mm; good to know it might be 1/4 sae though.
As for Campy two-bolt seat posts, I've had good luck using those skinny, flat, stamped MAFAC wrenches that came in the cheap tool-kit. The tall Rivet saddle that i'm using with this post also makes the adjustments easier.
...
[QUOTE=Desertdweller;18129926]
Originally Posted by
jeirvine
I've now ridden the Trek a bit, and the ride and fit are very nice. It might end up being a keeper. One odd thing I noticed is that the seatpost binder bolt seems to take a non-metric hex wrench. I wonder if it's original. Anyone else have one to compare? Also, the rear dropout spacing is 121mm. I would have expected 126mm by 1978, but maybe 120 was still prevalent then for even some higher-end bikes. I've got a Suntour Ultra-spaced 6-speed on it for now.[/QUOTE
my 1977 uses 1/4 sae in the seatpost. Spacing was 123. I have owned 3 1977 Trek 900's all used the sae threads. Always have to remember to take a wrench with me. Love your taste in bikes!