A rotor for a radial compressor comprising an axial shaft, wherein - the axial shaft comprises at least a first axial shaft segment, a second axial shaft segment, and a third axial shaft segment, and - the rotor extends in a longitudinal direction, the rotor comprising: - a first rotor disc comprising the first axial shaft segment and a first impeller, - a second rotor disc comprising the second axial shaft segment and a second impeller, and - a third rotor disc comprising the third axial shaft segment and a third impeller, wherein - the first, the second, and the third axial shaft segments (102, 112, 122) are longitudinal segments of the axial shaft of the rotor, - the first rotor disc, the second rotor disc, and the third rotor disc are adjacent to one another in the longitudinal direction, characterised in that - the rotor is provided with a first coupling means for coupling the first rotor disc to the second rotor disc with a first tie bolt for fastening the first rotor disc to the second rotor disc, wherein the first coupling means permits reversible axial splitting of the axial shaft into the first axial shaft segment and the second axial shaft segment, - the rotor is provided with a second coupling means for coupling the second rotor disc to the third rotor disc with a second tie bolt for fastening the second rotor disc to the third rotor disc, wherein the second coupling means permits reversible axial splitting of the axial shaft into the second axial shaft segment and the third axial shaft segment, - a third tie bolt is provided for fastening the first rotor disc to the third rotor disc, with the third tie bolt being inserted through a hole provided in the first rotor disc and a hole provided in the third rotor disc. - the axial shaft comprises at least a first axial shaft segment, a second axial shaft segment, and a third axial shaft segment, and - the rotor extends in a longitudinal direction, - a first rotor disc comprising the first axial shaft segment and a first impeller, - a second rotor disc comprising the second axial shaft segment and a second impeller, and - a third rotor disc comprising the third axial shaft segment and a third impeller, - the first, the second, and the third axial shaft segments (102, 112, 122) are longitudinal segments of the axial shaft of the rotor, - the first rotor disc, the second rotor disc, and the third rotor disc are adjacent to one another in the longitudinal direction, - the rotor is provided with a first coupling means for coupling the first rotor disc to the second rotor disc with a first tie bolt for fastening the first rotor disc to the second rotor disc, wherein the first coupling means permits reversible axial splitting of the axial shaft into the first axial shaft segment and the second axial shaft segment, - the rotor is provided with a second coupling means for coupling the second rotor disc to the third rotor disc with a second tie bolt for fastening the second rotor disc to the third rotor disc, wherein the second coupling means permits reversible axial splitting of the axial shaft into the second axial shaft segment and the third axial shaft segment, - a third tie bolt is provided for fastening the first rotor disc to the third rotor disc, with the third tie bolt being inserted through a hole provided in the first rotor disc and a hole provided in the third rotor disc.