It is the simplest, and most historic, damping scheme on the market: the rear wheel axle is connected directly to the main triangle on a single joint (hence the name of the system).
This system is also used a lot in the world of motors (Motocross / MotoGP) because in these cases there are no problems related to the optimization of pedaling or transmission operation.
The wheel axis moves in a constant arc pivoting on the main fulcrum. There are still purists of this system but it has become obsolete for 2 reasons:
-the fact that there is no control over the compression curve as the suspension compresses: it is defined as a “sincere” system, because it is intuitive and simple in its construction, but its compression curve is linear.
-is dependent on pedaling and braking forces.
SINGLE PIVOT OPERATION
Recognizing a Single Pivot system is very simple: the only shock absorbing pattern that can be recognized on the fly by being seen as experts in the eyes of friends. It is equipped with a single main arm with the main casing at the end while the rear wheel hub axis at the other end. The cushioning is very simple and direct being a single large arm that compresses the damper. In this system it is not easy to isolate the forces deriving from pedaling or braking.
ASSISTED SINGLE PIVOT
The evolution of the initial single pivot has led to the insertion of an additional support point that assists the whole, always presenting a single link (or articulated quadrilateral) to give a different compression curve to the shock absorber as it sinks: from the beginning at the end of the travel. The instant center is fixed throughout the rear wheel travel, like a classic Single Pivot.
Compared to other systems, it has limited control of Anti Squats, Pedal Kickback e Anti-Rise but it is a step forward compared to the original single pivot (monochrome).
