The Alston Pro-Gas Chassis is the original Alston Racing chassis. Alston has produced thousands of these chassis, allowing them to perfect the chassis design. Alston Pro-Gas Chassis are available in many different combinations; Mild or 4130 Chromoly Steel, 1-5/8" round tube or 2" x 3" rectangular tube frame rails, A-Arm or Strut front suspension and Ladder Bar or 4-Link rear suspension. These Chassis are mandrel bent for precise angles, designed to perfectly fit your car's body. Alston Pro-Gas Chassis are available in two chassis sizes, designed to fit most popular race car body styles.