Provided is an on-demand shock stiffening system. The on-demand shock stiffening system operates to immediately stiffen the shocks in response to a user activating the system. The system may include a main body with an oil flow aperture and a flow control system that operates to restrict the flow of oil between the reservoir and the shock. The on-demand shock stiffening system may be coupled between the reservoir and the bridge of the shock and operates to restrict flow of the oil in order to stiffen the shock immediately in an on-demand manner.