There is disclosed a fully mounted reversible plough (20) having a pivotally mounted plough beam (21) carrying pairs of plough bodies (22) and which can be rotated through 180° between right side and left side ploughing positions, and a depth control wheel (23) mounted on plough frame (21) to control the depth of ploughing, in which:
   the mounting of the depth wheel (23) comprises a rigid mounting bracket (24) secured to the plough frame (21) and extending transversely thereof, a first pivot arrangement (29) carried by the bracket (24) and defining a first pivot axis (31) which is upright in the ploughing position, a second pivot arrangement (36) connected to the first pivot arrangement (29) and defining a second pivot axis (37) extending substantially perpendicular to the first pivot axis (31), an adjustable locking mechanism (11, 32, 33) to lock the second pivot arrangement (36) in any required angular setting about the first pivot axis (31), and a wheel carrier arm (27) connected at one end to the second pivot arrangement (36) and rotatably mounting the depth wheel (23) at or near the opposite end; and in which upon each rotational plough reversal movement of the plough frame (21), the depth wheel (23) allows this movement by relative rotation of the first pivot arrangement (29) and the bracket (24) about the second pivot axis (37).