The BMW Motorrad duolever front wheel suspension represents the highest level of riding precision and steering accuracy. It combines the greatest possible riding comfort, sensitive feedback, and outstanding directional stability.
The BMW Motorrad engineers took as their basis a design patented by Norman Hossak of Great Britain. He had already fitted a number of BMW models with a double trailing link front wheel suspension as early as the eighties.
In kinematic terms, the duolever front wheel suspension is a square joint in which two trailing links made of forged steel are attached via rolling bearings to the frame.
Looking like a conventional fork, these trailing links guide the ultra torsionally rigid wheel carrier of gravity diecast aluminium. Supported by the frame, a central strut responsible for the suspension and damping is pivot connected to the lower of the two trailing links.
Mounted on the control head and wheel carrier, a trapezoidal shear joint is connected to the handlebar. This shear joint transmits the steering movements. Thus, unlike the telescopic fork, the duolever design does not need sliding and fixed tubes. At the same time, it decouples both the steering and the damping more consistently than the established telelever. As a result, the rider can enjoy a level of comfort and road grip that has yet to meet its match.
The advantage of this most innovative front wheel suspension on the motorcycle market at present is its torsional rigidity. The BMW Motorrad duolever front wheel suspension is not influenced by negative forces in the same manner as a conventional telescopic fork whose fixed and sliding tubes twist laterally as well as longitudinally during jounce/rebound and steering. Its two trailing links absorb the jounce/rebound forces, keeping the wheel carrier stable. This effectively neutralises twisting for a front wheel suspension of high precision. The rider's steering commands are converted directly, and the front wheel delivers unambiguous feedback in all riding conditions.
Yet another benefit is the kinematic antidive effect. This is achieved, like on the telelever, with a targeted arrangement of trailing link bearings. Whereas sudden braking manoeuvres cause a conventional telescopic fork to jounce heavily or “lock”, the duolever still has a sufficient reserve of spring travel, allowing the rider more time to brake in corners without sacrifice to directional stability.
Similar to a telescopic fork, the duolever also handles the front wheel's avoiding response when riding over rough terrain. This, together with the low unsprung masses and the system's small breakaway forces, results in more sensitive and comfortable response characteristics.
The BMW Motorrad duolever front wheel suspension combines features previously regarded as mutually exclusive. These are outstanding directional stability at high speeds, superior handling, a precise steering sensation, and a directionally stable brake response in every speed range.