Wilbers fork spring kit, progressive, for KAWASAKI GTR 1400, Type ZGT 40 A, Model Year 07-09, lowering 25 mm

Product details

Wilbers fork spring kit, progressive, for KAWASAKI GTR 1400, Type ZGT40A, Model Year 07-09, lowering 25 mm without reducing sleeves, (fork oil please order separately), with ABE according to the application list.

General Description

Depending on the application, Wilbers offers progressive or linear fork springs, manufactured from the best and highest quality chrome-silicon steel. For touring and touring-sport applications, we generally recommend a progressive fork spring to optimise responsiveness and, on the other hand, to increase bottoming resistance. The combination of the "Zero Friction" fork springs with the specially developed Wilbers fork oil and observing the correct air chamber for the respective vehicle is very important. If desired, individual tuning can be achieved in special cases by changing the air chamber.

For motorsport applications, we recommend the very light linear chrome-silicon fork springs from Wilbers, which were co-developed with the motorsport team.


"ZERO friction" friction reduction through slide grinding:

During slide grinding, the workpieces to be processed, such as Wilbers fork springs, are placed together with an abrasive body specially designed for this purpose in a vibrating container, known as a trough vibrator.

The vibrations of the container create a relative movement between the workpiece and the abrasive body, and the constant rubbing together leads to a smoothing of the workpiece surface. At the end of the process, a fine, shiny surface is achieved.

For Wilbers fork springs, this reduction in surface roughness means a minimisation of friction = ZERO friction.


Each fork spring set includes a recommendation for the viscosity of the fork oil and the air chamber height in the fork. These values have been determined by experienced Wilbers technicians and ensure optimal riding comfort and feedback at the front wheel.


Note: Please order the fork oil separately.