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 (D). 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 (D). <EOS>