So the actual head tube diameter is different between JIS and ISO forks? I thought I'd read from Sheldon Brown and elsewhere that frames were pretty indifferent and it was only the headset and fork that made the difference and that you could even swap in and out threadless for threaded just by changing headset, fork and stem? Am I mis-remembering that?
Or am I misunderstanding what I head tube is? That's the bit of tubing that connects the toptube to the downtube and that the headset and fork go in, right?
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Bikes: 1996 Eddy Merckx Titanium EX, 1989/90 Colnago Super(issimo?) Piu(?), 1990 Concorde Aquila(hit by car while riding), others in build queue "when I get the time"