The RHA will allow adjustment of the ride height of your motorcycle by ± 45mm. On the T300 series Triumphs, the ride height is determined by the length of the drop links in the rear suspension mechanism based on an inverse ratio of approx' 3.8:1 (inverse in that the shorter the link the higher the rear of the bike).
Currently fixed "dog-bone" linkages are present. The RHA's are designed to replace these (fixed 120mm length) linkages providing finely adjustable units. When fitted to the motorcycle, the RHA's length can be easily varied by ± 12mm (see "Long and Short" image).