Monotube vs. Twin tube
Monotube shocks are also known as gas shocks. Both monotube and twin tube shocks use gas pressure. Monotube shocks use a higher pressure of gas (nitrogen) on the opposite side of a floating piston to keep a constant volume of oil in the shock body as the shaft adds and subtracts volume when the shock moves. Twin tube shocks use a lower pressure gas in a bag to achieve the same result.
Monotube shocks have been around for many years. Their technology has just recently trickled down from Formula 1 racing through NASCAR to dirt track racing. Many engineers feel that monotube shocks have an advantage, since their larger pistons displace more oil for a given stroke. This is especially true for the rebound stroke. The greater the amount of oil moving through a shock’s piston, the easier it becomes to regulate the flow and thus control the dampening forces of the shock. Monotube shocks are also less prone to fade due to heat. They stay cooler because the piston and oil are in direct contact with the outside wall of the cylinder allowing for better dissipation of heat.
Twin tube shocks use a rupture-prone gas bag to hold the nitrogen. When this bag breaks the nitrogen mixes with the oil making the shock skip as the gas moves through the piston orifices. Bubbling noise can be heard when the shock is actuated by hand. In contrast, twin tube shocks can sometimes be advantageous: twin tube shocks can still function properly with small dents in the housing because of the use of their inner cylinder. They are generally much less expensive to repair, and the parts cost less. We can build of shock package to fit your needs with either type of shock, it really depends on your budget.