If you are shopping for a new bed frame, it is important to consider the size you need. The bed frame size needs to match the size of the mattress and box spring. A king size mattress would need a king size bed frame to rest on while a queen size mattress needs a queen size bed frame. Another thing to keep in mind is not only the width of your simple bed frame, but also the height you want your bed frame to be. If you plan to store things under your bed, a high bed frame is the best option,but if you would rather a shorter bed, then a short bed frame is right for you.