If you have unsprung wheelie bars, and your car is very violent when it leaves the line, the bars may be causing the rear to unload causing traction loss. The Alston Wheelie Bar Spring Conversion Kit is designed to smooth out the action of your existing wheelie bars. The secret to the Alston Wheelie Bar Spring Conversion Kit is in Alstons calibrated spring that helps absorb some of the initial energy. Alston Wheelie Bar Spring Conversion Kit comes complete with all parts necessary and detailed instructions.