In reply to ecrinscollective:
Used to live in Grenoble and climbed weekly in the surrounding crags albeit not quite to 7b. Presles is really good and a great location but as you say, much better for multi pitch.
Right around Grenoble itself my personal favourite is St. Pancrasse. 2 levels with about 8 different sectors cut into a small ledge looking over the gresivaudan. If you're there mid week you'll probably have the whole place to yourself.
Probably plenty of quiet places to park the car near St Hilaire.
Other good crags around Grenoble are Roche de Comboire, Le petit desert, saint egreve etc. These are right in the town but may be a bit easy for you with the exception of espace Comboire which has a wall of 7+s.
If driving back I'd go back via the vercors and you can take your pick of beautiful crags en route to la drome.
Let me know if you want any other info.