Thanks. I'd heard of the upper vs. lower issue before (and I suppose I'm particularly susceptible, being tall and having really long head tubes/steerer tubes and all). So at least that says there's likely not much difference between running the brake cable from the quill stem vs. from a hanger on the upper headset race. I may install one of the lower-mounted hangers later if I have chatter issues.
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"c" is not a unit that measures tire width