published tractive force value for any vehicle may be theoretical.
tractive , effort, or traction.
the term's usage in mechanical applications in which the final stage of the power transmission system is one or more wheels in frictional contact with a roadway.
If the drive wheels have such a torque applied to them that they are on the point of slipping in the plane of the wheel, then the value of adhesive force between tire and road surface has been reached (φ WR), where φ is the coefficient of adhesion between tire and road surface, and WR is the weight on the rear wheels. Under these conditions the engine torque has reached the maximum useful value for the present set of conditions, as any increase would only result in slip and lower acceleration. Static friction is higher than kinetic friction.
Tw = Te ig if ht [N m]
TE =Tw / Rw [N]