Having found the point along the lever where the 25mm stroke operates the gear change, this is then checked using the spring balance. This ensures that the effort required is within the range of the Kliktronic system. In practice the unit will comfortably cope with even the heaviest of boxes, such as Harley Davidson.
There are two distinct measurements to take: the effort required to overcome the return spring, and the somewhat heavier loading required to rotate the selector to the next gear. The range of operation for the Kliktronic is approximately 12lbs at the start of the stroke and close to 40lbs at the end.