I have a 2009 Sport model. Handbook says that 16 inch wheel is okay for s/chains, 17 wheel needs low-profile chains, 18 inch chains not allowed at all. If you look at the clearance between tyre and wing, you can see why! I have used chains for years on ski hols, but not on the Bravo.

I stopped skiing in 2006, but my experience is that you rarely need snow chains , except in the uncleared car park in the resort. If you need them on the motorway, then you are talking days to get there!! Chamonix is quite low and hence less likely to get cut off than say Les Deux Alpes, but to be brutally honest, if you find that you need chains and you are travelling at peak times, the roads to the ski resorts come very quickly to a halt as the police close them until they are safe, usually within a few hours and its best to get a hotel, especially if you are not experienced in driving in snow. Speaking as someone who has 4 sets of chains in his garage, its cheaper to hire them!!! I have seen signs saying snow chains compulsery, but this is usually only if you are crossing a pass e.g. Col de Luze and I dont know if you need to cross one.

Dont forget to take a spade and make sure your passengers are well dressed and have grippy shoes so that you can be pushed. The French are well organised and know that they have to keep the roads clear to enable skiers to spend their cash at the resorts, so they are on your side.

My suspicion with the Bravo tyres is that they will be not very good in snow, but I did not really try them out in the snow this year.

Good luck