Harvester header support for supporting a header of an agricultural harvester during road transport, which harvester header support comprises: a frame, which frame comprises: a harvester interface, which is connectable to an agricultural harvester, a first arm, which arm is pivotably connected to the harvester interface via a pivot axis, a first support wheel which comprises a first rotation axis and a tread, which first support wheel is rotatable around the first rotation axis, a first wheel connector, which is adapted to connect the first support wheel to the first arm of the frame, while allowing the first support wheel to rotate about the first rotation axis, and an arm drive, which is adapted to pivot the first arm relative to the harvester interface, in which the harvester header support has a road transport mode and a field operation mode and the arm drive is adapted to transfer the harvester header support from the road transport mode into the field operation mode and/or vice versa, in which road transport mode the first support wheel is in a road transport position with the tread being adapted to engage the ground which allows the first support wheel to bear at least a part of the weight of the header, and in which road transport position the first rotation axis of the first support wheel extends in a substantially horizontal plane for the tread to roll over the ground, and wherein in the field operation mode, the first support wheel is in a field operation position in which the first support wheel is free from the weight of the header and the first rotation axis of the first support wheel extends in a substantially vertical plane, the harvester header support being characterized in that, in the road transport mode and in the field operation mode, the pivot axis extends substantially in a main direction of driving. a frame, which frame comprises: a harvester interface, which is connectable to an agricultural harvester, a first arm, which arm is pivotably connected to the harvester interface via a pivot axis, a harvester interface, which is connectable to an agricultural harvester, a first arm, which arm is pivotably connected to the harvester interface via a pivot axis, a first support wheel which comprises a first rotation axis and a tread, which first support wheel is rotatable around the first rotation axis, a first wheel connector, which is adapted to connect the first support wheel to the first arm of the frame, while allowing the first support wheel to rotate about the first rotation axis, and an arm drive, which is adapted to pivot the first arm relative to the harvester interface, in which the harvester header support has a road transport mode and a field operation mode and the arm drive is adapted to transfer the harvester header support from the road transport mode into the field operation mode and/or vice versa, in which road transport mode the first support wheel is in a road transport position with the tread being adapted to engage the ground which allows the first support wheel to bear at least a part of the weight of the header, and in which road transport position the first rotation axis of the first support wheel extends in a substantially horizontal plane for the tread to roll over the ground, and wherein in the field operation mode, the first support wheel is in a field operation position in which the first support wheel is free from the weight of the header and the first rotation axis of the first support wheel extends in a substantially vertical plane, the harvester header support being characterized in that, in the road transport mode and in the field operation mode, the pivot axis extends substantially in a main direction of driving.