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Was going to just remove them, along with the rear and (maybe) front derailleur. But continue using the brifters just as brake levers. Can't see that causing any massive problems. Not sure if the shifter levers will flap about without the cable tension or not - but will cross that bridge when I come to it.
TheSchwartz-
I don't think they will flap about. The problem I am seeing is that since the gear cables are running underneath the bar tape I'd have to remove and then re-wrap the bar each time I'm going to Single speed and back. Granted, in your situation doing this 2x a year is probably tolerable, but I am planning on changing wheels more regularly. Was thinking of going retro and using downtube shifters instead for that reason, I think I saw someone on here doing this with their SS some time ago.
BTR88
Nice project, very similar to what I'm planning myself at the moment.
When changing from geared to SS, what are you going to do with the gear cables?