The frame is composed of what Folding electric bikes

Most iron frame , but the frame is divided into iron in the iron added to the other extreme frame chrome molybdenum Folding electric bikes steel, high strength steel , ordinary steel , etc. , after adding the other ingredients , for example can be made thinner pipe, makes the frame lighter overall . Recently, on the basis of the intensity is not reduced , there has been used a frame material other than iron , such as aluminum. Bicycle electric trike race to have carbon fiber material using titanium frame .