An agricultural vehicle chassis comprising: - two side half-chassis (21, 22) connected to each other at a distance from each other to form a rigid structure, - a device for adjusting the relative distance between the two side half-chassis (21, 22), said adjustment device comprising: -- at least one compass (41, 42): --- comprising two rigid arms hinged to each other by a hinge, called central hinge (53, 73): ---- comprising a pivot, ---- and allowing the two arms to be oriented relative to each other so that they form an angle therebetween, called a compass angle, comprised between 0° and 180°, --- each arm of the compass being respectively hinged to one of the two side half-chassis (21, 22) by a hinge, called side hinge (49, 50, 69, 70), comprising a pivot, --- said pivots of the central hinge and of the side hinges having pivot axes which are parallel to each other, -- a device (56, 76, 93) for adjusting the compass angle, this device for adjusting the compass angle being adapted to allow a blocking of the compass angle after adjustment, characterised in that the device (56, 76, 93) for adjusting the compass angle of at least one compass includes a cylinder comprising a body carried by one of the two arms of the compass and an actuating rod hinged to the other arm of the compass. - two side half-chassis (21, 22) connected to each other at a distance from each other to form a rigid structure, - a device for adjusting the relative distance between the two side half-chassis (21, 22), said adjustment device comprising: -- at least one compass (41, 42): --- comprising two rigid arms hinged to each other by a hinge, called central hinge (53, 73): ---- comprising a pivot, ---- and allowing the two arms to be oriented relative to each other so that they form an angle therebetween, called a compass angle, comprised between 0° and 180°, --- each arm of the compass being respectively hinged to one of the two side half-chassis (21, 22) by a hinge, called side hinge (49, 50, 69, 70), comprising a pivot, --- said pivots of the central hinge and of the side hinges having pivot axes which are parallel to each other, -- a device (56, 76, 93) for adjusting the compass angle, this device for adjusting the compass angle being adapted to allow a blocking of the compass angle after adjustment, -- at least one compass (41, 42): --- comprising two rigid arms hinged to each other by a hinge, called central hinge (53, 73): ---- comprising a pivot, ---- and allowing the two arms to be oriented relative to each other so that they form an angle therebetween, called a compass angle, comprised between 0° and 180°, --- each arm of the compass being respectively hinged to one of the two side half-chassis (21, 22) by a hinge, called side hinge (49, 50, 69, 70), comprising a pivot, --- said pivots of the central hinge and of the side hinges having pivot axes which are parallel to each other, --- comprising two rigid arms hinged to each other by a hinge, called central hinge (53, 73): ---- comprising a pivot, ---- and allowing the two arms to be oriented relative to each other so that they form an angle therebetween, called a compass angle, comprised between 0° and 180°, ---- comprising a pivot, ---- and allowing the two arms to be oriented relative to each other so that they form an angle therebetween, called a compass angle, comprised between 0° and 180°, --- each arm of the compass being respectively hinged to one of the two side half-chassis (21, 22) by a hinge, called side hinge (49, 50, 69, 70), comprising a pivot, --- said pivots of the central hinge and of the side hinges having pivot axes which are parallel to each other, -- a device (56, 76, 93) for adjusting the compass angle, this device for adjusting the compass angle being adapted to allow a blocking of the compass angle after adjustment,