I'm planning on some French Alpine riding this summer, which has prompted an unusual flurry of winter hill training and much mulling over of maps and online cycle emporia.
Because of some of the routes we're thinking about taking, it looks as though we might have to be able to take enough stuff with us for overnight stays - not camping, just a change of clothes etc - together with a bit of photographic equipment. So I'm contemplating putting a rack on my rack-ready Enigma Etape and taking a lightweight bag (or two). Because I'm a bit of a ponce and it's titanium, like the bike, I'm looking seriously at the Tubus Airy. What I'd really like is a lightweight expandable bag a bit like this Topeak but I'm not sure it'll work with the Tubus rack because of its mounting mechanism. Does anyone know whether it will work or not? If not, are there alternatives (to the bag I mean...I don't really want a kilo of Topeak rack on my bike)?
Given we'll be carrying a bit of stuff and this is the Alps we're talking about after all, I've also be thinking about switching to a friendlier casette than the 12-25 I'm currently using. I've seen 10-speed 12-29 and even 12-30 casettes, which I'm tempted by, but I'm not sure if I'd need a long derailleur cage for these. Anyone know? Is that an easy job? We're talking Campag Centaur here BTW.
TIA for any pointers.