Swift Springs 045-163-130B Barrel Coilover Spring 4.5in x 1.63in ID 130 lb/in Quarter Midget

The Swift Springs 045-163-130B is a Barrel-style coilover spring engineered specifically for Quarter Midget racing applications. Measuring 4.5 inches in length with a 1.63-inch inner diameter and a 130 lb/in spring rate, this spring delivers precise, linear suspension performance in demanding motorsport environments.

Swift Springs manufactures all of their coilover springs using HS5/TW alloy steel, a proprietary material that is far superior to conventional silicone chrome steel. This advanced material allows Swift to wind a more responsive spring with fewer coils, resulting in reduced un-sprung weight and increased usable stroke compared to competing designs.

The Barrel coil design was engineered with ease and consistency of vehicle setup in mind. The barrel profile maintains a maximum 4-inch outer diameter, ensuring dimensional consistency across all spring rates in the lineup — so racers can swap rates without worrying about fitment variations.

Key Specifications:

• Part Number: 045-163-130 B
• Coil Style: Barrel (B)
• Length: 4.5 inches
• Inner Diameter: 1.63 inches
• Spring Rate: 130 lbs/inch
• Usable Stroke: 2.4 inches
• Maximum Stroke: 3.2 inches
• Maximum Load: 420 lbs
• Material: HS5/TW Alloy Steel
• Application: Quarter Midget Racing

Engineered for racers who demand consistency and reliability, the Swift Springs barrel coilover spring is a trusted choice in Quarter Midget competition and other short-track motorsport classes.