Take those old 2X4s and put them to great use building this easy DIY bike rack. If you have kids, and those kids have bikes, you know how those bikes can be left out or topple over, getting in the way of everything. You can build this great basic bike rack in the garage, on the porch, or wherever you normally store your bikes. It keeps everyone’s bike separate and keeps them from falling over when they’re not in use. Plus, it’s a really easy build.