Drive arm for a spreader

A substantially elongate drive arm for a vehicular spreader, said drive arm mounted to extend substantially radially from a spreader drive shaft, a drive wheel provided on said drive arm being spaced from said drive shaft, said drive wheel and said drive shaft being connected by a drive means mounted on said drive arm to enable the transfer of driving forces therebetween, said drive arm pivotable in a first direction relative to said drive shaft to engage said drive wheel with a ground wheel of said spreader to enable the transmission of a driving force from said ground wheel to said drive shaft, said drive shaft being driven rotatably in a second direction opposite to said first direction such that in use a torque reaction occurs in response to the action of the driving force on a load in said drive shaft whereby forces of engagement urging contact between the drive wheel and the ground wheel increase as the load increases.