**Bones**

Density average 1.84 g/cm³ for dry bone.

This would be a pretty bad material for a bike frame, and its quite likely that any bone bike really has a metal core in the middle.

[![enter image description here][1]][1]

**Advantage** 

 * Shock factor, or as part of a costume ("Death rides a Pale Horse")

**Disadvantage** 

 * Bones aren't particularly structural by themselves.  A skeleton is made from tendons and cartilage and soft tissues as well.

 * Durability - bones that dry out get brittle and will snap easily.

 * Intolerant - A crack could go from a minor hairline to a full break very quickly.

  [1]: https://i.sstatic.net/KTSqr.jpg