A rotor assembly for an agricultural baler, the rotor assembly comprising: a rotor shaft having a central portion and first and second end portions (60a, 60b) either side of the central portion, the rotor shaft defining a first shaft section between the first end portion and the central portion, and the rotor shaft defining a second shaft section between the central portion and the second end portion; and, a plurality of tine plates to be arranged axially along the rotor shaft, each of the tine plates comprising at least one tine, and wherein the tine plates are arranged such that there is an angular spacing between the at least one tine of adjacent ones of the tine plates, wherein in the first shaft section a magnitude of the angular spacing is greater or smaller at the central portion than at the first end portion, and wherein in the second shaft section a magnitude of the angular spacing is greater or smaller at the central portion than at the second end portion the rotor assembly being characterised in that in the first and second shaft sections (52a, 52b) the magnitude of the angular spacing is greater at the central portion than at the first and second end portions (60a, 60b) and decreases from the central portion to the first and second end portions (60a, 60b), or in the first and second shaft sections (52a, 52b) the magnitude of the angular spacing is smaller at the central portion than at the first and second end portions (60a, 60b) and increases from the central portion to the first and second end portions (60a, 60b). a rotor shaft having a central portion and first and second end portions (60a, 60b) either side of the central portion, the rotor shaft defining a first shaft section between the first end portion and the central portion, and the rotor shaft defining a second shaft section between the central portion and the second end portion; and, a plurality of tine plates to be arranged axially along the rotor shaft, each of the tine plates comprising at least one tine, and wherein the tine plates are arranged such that there is an angular spacing between the at least one tine of adjacent ones of the tine plates, wherein in the first shaft section a magnitude of the angular spacing is greater or smaller at the central portion than at the first end portion, and wherein in the second shaft section a magnitude of the angular spacing is greater or smaller at the central portion than at the second end portion the rotor assembly being characterised in that in the first and second shaft sections (52a, 52b) the magnitude of the angular spacing is greater at the central portion than at the first and second end portions (60a, 60b) and decreases from the central portion to the first and second end portions (60a, 60b), or in the first and second shaft sections (52a, 52b) the magnitude of the angular spacing is smaller at the central portion than at the first and second end portions (60a, 60b) and increases from the central portion to the first and second end portions (60a, 60b). in the first and second shaft sections (52a, 52b) the magnitude of the angular spacing is greater at the central portion than at the first and second end portions (60a, 60b) and decreases from the central portion to the first and second end portions (60a, 60b), or in the first and second shaft sections (52a, 52b) the magnitude of the angular spacing is smaller at the central portion than at the first and second end portions (60a, 60b) and increases from the central portion to the first and second end portions (60a, 60b).