Originally Posted by
coolhandjjl
I’d like to put barcons on another bike, but that one has no shifter bosses on the down tube. Can I use something like this?
Or will the shifter cables coming off the handlebar now constantly rub on the head stem with the lower piece?
I guess you mean the head tube, not the stem. Preferably size the cable so it's only just touching the head tube in the straight ahead position, then stick on some rub-resistant transparent patches like
these to protect the paint (or you can just buy "helicopter tape" and cut it to shape/size yourself).