Abstract: The invention concerns to a method and arrangement for a suspension system that may be constituted by a harvesting trait of a forestry harvester and which suspension system is of the type that has a wheel supported and provided with an angle sensor in order to form a measurement wheel for the measurement of length, with an arm pivotably attached to a frame in such a manner that the wheel can be adjusted from positions in contact with and out of contact with a surface of the object whose length is to be measured while the object is fed in its longitudinal direction past the measurement wheel running against the circumference of the measurement wheel, whereby the said object may be constituted by a tree trunk taken up into a harvester unit.

Abstract: The invention concerns a method and an arrangement for a suspension system that may be, but does not necessarily need to be, constituted by a harvesting unit of a forestry harvester and which suspension system is of the type that has an arm (2) on which a wheel (4) is supported and provided with an angle sensor (4a) in order to form a measurement wheel for the measurement of length, and which arm is attached in a manner that allows it to pivot to a frame (3) in such a manner that the wheel can be adjusted from positions in contact with and out of contact with a surface (5) of the object whose length is to be measured while the object is fed in its longitudinal direction (5a) past the measurement wheel running against the circumference of the measurement wheel, whereby the said object may be, but does not necessarily need to be, constituted by a tree trunk taken up into a harvester unit.