DTOTW - Case study covering bikes, folding bikes and some issues relating to the materials and manufacture. Useful links relating to the development of bikes, folding bikes, steels and alloys used in their construction and information on the earliest bikes and their designs. Design & Technology On The Web - Help for students at KS3, KS4 and KS5 - GCSE Engineering, Resistant materials and Insustrial Technology - Students and teachers Help