There are three types of two-wheeler rear shock absorbers namely spring loaded hydraulic suspension, nitrox suspension and mono shock absorber.

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A shock absorber or shocker is filled with damping fluid. The movement of the piston in the cylinder is responsible for the dampening effect. As you know, the oil within the shock absorber is endowed with the task of absorbing the shocks. But, over time they are known to form air bubbles and thus reducing the dampening effect. This was what gave the way to the Nitrox Suspension.

As the name suggests, this system uses Nitrogen gases. A cylinder containing pressurized Nitrogen gas is fixed alongside the spring and shock absorber unit. This gas assists in preventing cavitation, or bubble formation within the system. The Nitrogen gas container also stores some shock absorber fluid and helps in keeping the form constant throughout without resulting in any foaming. This is the Nitrox Suspension.

These types of shock absorbers are actually called as ‘Gas Filled Shock Absorbers’. The visual differentiation between a conventional shock absorber and a gas filled shock absorber is a small canister (box) which is attached on one side of it. This canister holds a small amount of Nitrogen gas in it. Hence these hydraulic shock absorbers or dampers are called as gas filled shock absorbers.

A typical shock absorber or an hydraulic damper contains oil with two tubes sliding inside one another and also has a piston inside. It also has a valves inside. The oil inside the damper moves along the valves as the piston moves up and down to absorb the shocks. These dampers have a tendency for the oil to form foam under heavy use and riding conditions. The foaming is usually caused by air bubbles inside oil during suspension action. This is similar to shaking a can of oil. After shaking the oil inside the can gets foamed. Similarly the same case happens to a hydraulic damper also. This foaming temporarily reduces the damping ability of the unit.

In order to solve this, a secondary cylinder is connected to the shock absorber which acts as a reservoir for the oil and pressurized gas (nitrogen). The pressurized nitrogen gas inside the canister prevents foaming of hydraulic oil inside the damper due to heavy usage or damping action. Due to this, the performance of the suspension remains constant.

This nitrogen gas also helps in absorbing the road undulations and provides a smooth ride for both the rider and the pillion.

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