BMW Motorrad K 1300 GT Rider's Manual page 104

of which can be restricted
6
electro-hydraulically using
a displaceable sleeve. The
100
more the sleeve encloses the
plastic element, the more the
expansion of the plastic element
is restricted, causing the spring
rate to increase. The maximum
spring rate is achieved when the
sleeve completely encloses the
plastic element and rests on the
steel spring. By the same token,
the spring rate decreases when
the sleeve allows the plastic
element to expand further.
z