Originally Posted by
Ciufalon
I have a '74 Professional - also pictured in that brochure with the Competition and very close to the same bike. Let me know if I am wrong, but I think you are in for a nice surprise when you get that thing together.
the Pro was a lighter frame, IMHO, and came with light tubular wheels and a twin-plate fork with round blades...I had both and the build quality was just a bit better on the Pro, too, but not by miles. Back then there wasn't a distinction between Tange Champion #1 or #2 but I was of the opinion that the Pro used what was equivalent to #1 and all the rest used lesser tube-sets. The Comp and Semi-Pro seemed like heavier tubing but I didn't ever compare naked frames.
The OEM seat post was probably a Taihei Compe, and on a Pro was probably 26.8.
BB threading *1.37" x 24 tpi is British BSC standard.