well it has been a while so maybe x-cop or others can comment, but headed down valley from aspen on 82, take a left at Carbondale.
the road will follow the flank of Sopris and take you through Redstone, Marble, and Paonia, around there the road to Crested butte turns off left. It is dirt in parts but graded.
the drive to Paonia and back is amazing, but if you add the leg to Crested Butte you go through a stand of Aspens that was thought to be the largest living single organism for years, before they found some algae that lives in the great lakes.
Any how it is mind blowingly beautiful if you hit it right and I love both all thse towns in te fall.
A colorado map will help with my suggestion. and show you the road ( closed in winter)