The device is intended to fulfil both of two basic requirements :
a)
Many owners find the seat height of these comparatively top-heavy motorcycles too high, such that they have difficulty in mounting and slow speed manoeuvring. They need to lower the ride height.
b)
Many owners find the standard rear springing too soft for heavily loaded use (eg, 2-up touring with luggage), even at maximum preload adjustment. They require raising the ride height to retain correct steering geometry for this type of use.
There is a known modification to solve this (a) which involves rotating the concentric chain adjusters by 180 degrees and pulling the forks through the yokes. There are certain disadvantages to this method in that the chain drive routing is compromised leading to premature rubbing strip wear, which can lead to damage of the swinging arm near to the pivot point.
It is not possible to raise the ride height by fitting a longer shock absorber (on these machines) without removing the two centre stand support lugs from the rear engine mounting plates (which is what the Speed Triple series racers did). It is possible to increase the rake angle (to "quicken" the steering) by pulling the forks through the steering yokes, however this restricts front suspension travel and on the Trophy means that the top yoke cover must be removed. Ground clearance is also compromised using this method.
Fitting the RHA allows both raising and lowering of the ride height by upto 45mm, allowing you to set up the geometry to suit the circumstances easily and quickly. Speed Triple and Daytona owners can set the bike up for track use without compromising ground clearance, in fact this can be increased in addition to reducing the rake angle. Trophy owners can set up the bike so that steering geometry is more "SPORTY" than "TOUR" or can lower the bike to make it easier to mount and dismount.