Yes, was my main goal of the summer with a few longer rides to build up to that.That's a big day out to say the least.
Had a week staying in Crolles back in 2023. It's a spicey climb up to the Bastille! Loved my solo day out through the Chartreuse, stunning scenery and so quiet.
There are not many roads like the climb to the Bastille, where 12% feels nice after the 24% section. I think the steepest part is 33% on the inside of one of the hairpins.