Rotor of a gas turbine, having a first rotor disk which has, distributed on the outer circumference, a plurality of first blade retention grooves penetrating the rotor disk axially and has an encircling, axially extending first fastening projection arranged, on the side pointing toward the rotor axis, below the first blade retention grooves , and having a second rotor disk which is fixedly connected to the first rotor disk and has, distributed on the outer circumference, a plurality of second blade retention grooves penetrating the rotor disk axially and has an encircling, axially extending second fastening projection arranged, on the side pointing toward the rotor axis, below the second blade retention grooves , and having a ring-shaped encircling rotor component which has, on one side, an encircling, axially opening first annular groove and, on the opposite side, an encircling, axially opening second annular groove , wherein the first fastening projection engages into the first annular groove and the second fastening projection engages into the second annular groove , characterized in that , in a standstill state, - a first groove outer flank of the first annular groove bears under contact pressure against a first projection outer flank of the first fastening projection , and - a clearance is present between a first groove inner flank of the first annular groove and a first projection inner flank of the first fastening projection . having a first rotor disk which has, distributed on the outer circumference, a plurality of first blade retention grooves penetrating the rotor disk axially and has an encircling, axially extending first fastening projection arranged, on the side pointing toward the rotor axis, below the first blade retention grooves , and having a second rotor disk which is fixedly connected to the first rotor disk and has, distributed on the outer circumference, a plurality of second blade retention grooves penetrating the rotor disk axially and has an encircling, axially extending second fastening projection arranged, on the side pointing toward the rotor axis, below the second blade retention grooves , and having a ring-shaped encircling rotor component which has, on one side, an encircling, axially opening first annular groove and, on the opposite side, an encircling, axially opening second annular groove , wherein the first fastening projection engages into the first annular groove and the second fastening projection engages into the second annular groove , characterized in that , in a standstill state, - a first groove outer flank of the first annular groove bears under contact pressure against a first projection outer flank of the first fastening projection , and - a clearance is present between a first groove inner flank of the first annular groove and a first projection inner flank of the first fastening projection . - a first groove outer flank of the first annular groove bears under contact pressure against a first projection outer flank of the first fastening projection , and - a clearance is present between a first groove inner flank of the first annular groove and a first projection inner flank of the first fastening projection . <EOS>