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Multi-walled carbon nanotubes (MWCNTs) show an oscillation in electrical resistance (from I - V measurements) during mechanical distortion in which peak separation is inversely correlated with the diameter of the MWCNTs. These results provide the first experimental support of the theoretical prediction that distortion causes Van Hove singularities and Dirac cones in MWCNTs to misalign and cause the opening of the band gap, and suggest that when fabricating contacts for CNTs for device applications, the pressure caused by the contact deposition method must be taken into account for manufacturing devices with consistent properties., Competing Interests: There are no conflicts to declare., (This journal is © The Royal Society of Chemistry.)