XRAY XB4 Spring Sets

New optional progressive and linear springs. The springs have been specifically designed to complement the big bore shocks. Set of 2.
The spring rate of the linear springs is constant during the entire spring compression.
The main advantage and benefit of progressive springs is that as the car initially enters the corner they work like soft springs to provide maximum traction. At the same time, when the chassis begins to roll, in the middle of the corner, the spring rate progressively increases until they work like a hard springs which allows the car to maintain maximum cornering speed.