The ZiZZO Ferro is a steel bike that was designed to fit all budgets and needs of our customers. Even though the Ferro is designed in house, sometimes due to to part sourcing we have to use different manufacturers in order to have our bikes produced to our high standards. This is the reason for having two different manuals for one bike. The Ferro is the same bike with one major difference, the folding frame lock, both are built to the same high quality standard they just have different internals. So utilize the photos below to decide which style frame lock you have.