SS road bike will be just the ticket for riding around in town.
There’s some really good bike paths leading out of town, along the isere valley for example and up towards Chambery which are generally flat. Driving around town is a nightmare and there’s long (20 years odd) ongoing debates about new ring roads and other transport solutions.
We’re about an hour away in some lumpy hills just above the isere valley. Lac du Paladru is where our nearest signed bike trails are but not ridden them yet. They are quite rolling rather than steep rocky technical as they are on glacial deposits. We live on the edge of a large forest ‘Chambaran’ which in the UK would have built trails all over it. I’ve always thought it needs someone with a lot of time and drive to open it up. It could be very good…. in a flowy tight twisty singletrack style rather than shredding gnarr. As it is there’s some little bits of singletrack but linked up with tracks which are predominantly formed of rounded glacial style pebbles.
MTB wise I ride rigid ss and it’s fine round ours….
Of course, as has been pointed out Bourg d’Oisans is about 40 minutes drive away!…
and in winter, the town is circled by ski resorts that are great for day-skiing: Les Sept Laux, Chamrousse, Villard de Lans etc.