A weekly free bike coop where you can use mechanics' tools and expertise to fix your bike? Free clinics where schoolkids or neighbors learn to maintain or build their own bikes from used parts? While Chauncey and Dash Tudhope-Locklear make a living repairing bicycles, volunteer projects support their mission of empowering "social change through bicycles." With an eye to local food self-reliance, they even repair farmers' bicycles for free.