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Twin shock refers to motorcycles that have two shock absorbers. Generally, this term is used to denote a particular era of motorcycles, and is most frequently used when describing off-road motorcycles. During the late 1970s and 1980s, motorcycle rear suspension design and performance underwent tremendous advances.
WP rear shock unit on a KTM 950 Adventure in 2007. WP Suspension GmbH is a manufacturer of components for motorcycle suspension systems based in Austria. The company was founded in 1977 by Wim Peters in Malden, Netherlands [1] and is amongst the largest manufacturers of suspension components for motorcycles. [2]
The rear suspension can consist of several shock arrangements: Dual shocks, which are placed at the far ends of the swingarm; Traditional monoshock, which is placed at the front of the swingarm, above the swingarm pivot bolt; Softail style suspension, where the shock absorbers are mounted horizontally in front of the swingarm, below the ...
A shock absorber or damper is a mechanical or hydraulic device designed to absorb and damp shock impulses. It does this by converting the kinetic energy of the shock into another form of energy (typically heat) which is then dissipated. Most shock absorbers are a form of dashpot (a damper which resists motion via viscous friction).
Performance suspension is the lower end line and often comes OEM (Original Equipment Manufacturer) on many cheaper bikes. They have older Dampers, technology and design. Performance Elite and Factory are the higher end, having the same damper options and only differ for the stanchion coating.
The HRD-Vincent Motorcycle is a famous early form of this type of swingarm, though Matchless used it earlier, and Yamaha subsequently. The Harley-Davidson Softail is another form of this swingarm, though working in reverse, with the shock absorbers being extended rather than compressed. Moto Guzzi's CRDS variant of the parallelogram
Yamaha XS400 in Cameroon (2019). A dual overhead-cam variant (XS400k) was also produced in 1982 and 1983 with a rear mono-shock and updated styling. The XS400 came equipped with a 6-speed transmission , wet plate, 6 friction disk clutch, chain drive, tachometer, self-canceling turn signals, both electric and kick starters, adjustable rear shock ...
The Yamaha XS Eleven motorcycle, also called XS 1100 and XS 1.1, is a Japanese standard produced from late 1977 (MY1978) to 1983, powered by an air-cooled 1,101 cc (67.2 cu in) 4-stroke, DOHC inline four-cylinder engine mounted transversely in a duplex cradle frame with swingarm rear suspension, shaft drive, and telescopic forks. [4]