A slip-in-tube drive shaft is a collapsible design consisting of a tube within a tube, allowing for adjustable length. It differs from one-piece and two-piece drive shafts, which are rigid and consist of either a single long metal bar or two connected shafts. The material used for a drive shaft must possess sufficient torsional rigidity to withstand torque without failing. While technically feasible, the use of drive shafts in bicycles is uncommon and not widely observed in practice. Overall, the suitability of a slip-in-tube drive shaft for bicycles remains largely theoretical.
