Horst link suspension – named after the man who pioneered it, Horst Leitner – is marked out by a pivot on the chainstays, between the rear axle and mainframe pivot. It’s often referred to as a ‘four-bar’ set-up, because it splits the bike’s rear end into four sections, each connected via pivots (chainstay, seatstay, rocker link and seat tube). As on a linkage-driven single-pivot bike, the four-bar linkage allows control of the leverage ratio. But, because the rear axle isn’t directly connected to the mainframe, it moves in a path which isn’t centred around any one of the pivots. Instead, an instant centre defines the direction of the rear wheel at any given point in the travel. Depending on the position of this instant centre, the effect of braking forces on the suspension – known as anti-rise – can be reduced relative to any single-pivot design. This may improve the sensitivity of the suspension while braking. Specialized patented the design in the mid 1990s and continue to use it on their ‘FSR’ bikes. This meant other US brands could only use it under licence, so most looked for alternatives. It remained popular with European manufacturers such as Whyte and YT though, and since the patent expired a couple of years ago, a load more brands have begun using it, including Nukeproof and Transition.