In this work, the piezoresistive properties of a two-dimensional material are studied using the example of a fragment of graphene nanoribbons of the "arm-chair" and "zig-zag" types. The dependence of the longitudinal component of the piezoconductivity tensor of nanoribbons on the value of a relative elastic-plastic deformation is analyzed. It has been shown that conductive ribbons exhibit stable piezoresistive properties which do not depend on its width, but depend only on the structural modification of the zig-zag or arm-chair. Small plastic deformations abruptly change the longitudinal component for zig-zag ribbons by an order of magnitude more than for arm-chair ribbons. Semiconductor ribbons of relatively small width have a "hyperpiezoresistance" effect, which disappears with increasing the ribbon width in proportion to the decrease in the band gap. Keywords: straintronics, graphene, nanoribbons, piezoresistive effect, elastic-plastic deformations.