
The Bizz Johnson Trail is not in the Sierra Nevada Mountains, but misses by only a couple miles.
The BLM and Lassen Lands and Trail Trust hosts a Fall color ride down the Bizz every Fall (Oct 21 this year). They bus you and your bike to the upper trailhead and you ride the 25 miles back to Susanville. The upper reaches of the trail were all well past peak color and not much there. From the meadow at Westwood Junction where the trail first crosses the Susan River the colors started. It was cold and windy until the last few miles.
Pictures at:
http://new.photos.yahoo.com/dsandbro/#page1
Can't get the img tags to work. Looks like Yahoo does not allow hotlinking.