In response to yet another frame materials question, I thought it might be useful to start with a more answerable question. One answer per material please, with an example of a bicycle frame using that material. Please use the format I've used in my answer(s) to make it easy to compare materials. I see no harm in having all 400+ steel alloys listed if someone wants to do that, but "steel" must specifically be low-grade mild steel rather than a specific alloy. Likewise for aluminium, titanium, magnesium and other metals. For composites, including metal composites, I would again prefer specific examples with details (there's a big difference between steel reinforced concrete and kevlar/polyester composites). I would also love to see weird and wonderful bikes included. ##Materials (ie index to answers. Please update links as you add an answer): ###Metals - **Aluminum Bikes** - **[Aluminum](https://bicycles.stackexchange.com/a/58015/26330)** - **[Scandium](https://bicycles.stackexchange.com/questions/43838/what-different-frame-materials-have-been-used/44545#44545)** - Aluminium alloy - **Steel Bikes** - **Columbus Steel** (not written yet) - **ChromeMoly Steel** (not written yet) - **[Gaspipe Steel](https://bicycles.stackexchange.com/a/45078/19705)** - **Ishiwata Steel** (not written yet) - **Kaisei Steel** (not written yet) - **[Mild Steel](https://bicycles.stackexchange.com/a/43839/8273)** - **[Reynolds Steel](https://bicycles.stackexchange.com/a/45082/19705)** (needs extension) - **Tange Steel** (not written yet) - **Vitus/Super Vitus Steel** (not written yet) - **[Titanium](https://bicycles.stackexchange.com/a/44493/19705)** - **[Beryllium](https://bicycles.stackexchange.com/a/57625/26330)** - **[Gold (pure)](https://bicycles.stackexchange.com/a/43845/19705)** (theoretical) - **Magnesium** (not written yet) ###Organic - **[Bamboo](https://bicycles.stackexchange.com/a/44989/31280)** - **[Bones](https://bicycles.stackexchange.com/a/43849/19705)** - **Wood Bikes** - **[Carved Wood](https://bicycles.stackexchange.com/a/44550/19705)** - **[Plywood](https://bicycles.stackexchange.com/a/43842/7044)** (composite) - **[Wood](https://bicycles.stackexchange.com/a/43843/7044)** (complete frame and bicycle) - **Cardboard** (not yet written) (https://bicycles.stackexchange.com/a/44582/20060)** ###Composites and Polymers - **[Carbon Fibre](https://bicycles.stackexchange.com/a/43854/13174)** - **[Flax fiber (90% flax, 10% carbon)](https://bicycles.stackexchange.com/a/44582/26330)** - **[Plastic]( https://bicycles.stackexchange.com/a/57627/35081)** ###Layout Specific - **[Cables](https://bicycles.stackexchange.com/a/43847/19705)** aka Tensegrity or Tensional Integrity - **[3D Printed](https://bicycles.stackexchange.com/a/43848/19705)** (not yet written)