In reply to ewanjp:
I used 1 8.3mm half rope for everything I did in Chamonix, including 200m 5c and 6a, the 5c which needed to be abbed off. Which did involve abbing off 1 bolt several times. (Back it up until the last person goes)
We used it as a single. Even had a grigri on it at one point if I remember correctly.
take a thumb sized wire if nothing else/rock 7.
Personally my fail safe sport rack now is 5 wires and a cam. Friend 1 but I don't know the route.
Have fun
Post edited at 23:02