Bicycle Bread (the bakery)
It seems to me Chowhound has gotten away from it's "Great little hole-in-the-wall" emphasis, but Bicycle Bread qualifies in this category. And they've just increased their hours by 1/3rd--they're now open 3 hours per week, Thursday from 5 to 8 pm. They have a limited selection of breads, but all are made with freshly ground wheat. Their name is derived from the fact that they make deliveries by bike in the USC area.
1840 S Union Ave, Los Angeles, 90015