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Most motorcycles today use telescopic forks for the front suspension. The forks can most easily be understood as simply encased long coil springs with hydraulic damping of excess spring energy. They allow the front wheel to react to imperfections in the road while isolating the rest of the motorcycle from that motion. Telescopic forks on a 1969 BMW
A selection of conical coil springs. Spring rate is the measurement of how much a coil spring can hold until it compresses 1 inch (2.54 cm). The spring rate is normally specified by the manufacture. If a spring has a rate of 100 then the spring would compress 1 inch with 100 pounds (45 kg) of load. [1]
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]
Motocross – The current Motocross line designated by SX includes 50, 65, 85, 105, 125, 150, 250 and 300 cc single-cylinder two-stroke models (the 50 SX, 65 SX and 85 SX models are kids' and youth bikes), and 250, 350 and 450 cc single-cylinder four-stroke models (SX-F). [38] In 2005 KTM released the new 250SX-F to the general public.
A torsion spring's rate is in units of torque divided by angle, such as N·m/rad or ft·lbf/degree. The inverse of spring rate is compliance, that is: if a spring has a rate of 10 N/mm, it has a compliance of 0.1 mm/N. The stiffness (or rate) of springs in parallel is additive, as is the compliance of springs in series.
The most common example is in a vehicle's suspension, where it is used to describe the displacement and forces in the springs and shock absorbers. The force in the spring is (roughly) the vertical force at the contact patch divided by the motion ratio, and the spring rate is the wheel rate divided by the motion ratio squared.