Hyperco 3.75″ I.D. x 20″ Free Length Coilover Spring, G Series, 200-450 lbs/in Rate (Choose Rate)
$193.00
Hyperco 3.75″ I.D. x 20″ Free Length Coilover Springs — G Series

Hyperco high-performance G-series coilover springs in a 3.75″ (95.2 mm) inside diameter and 20″ (508.0 mm) free length. Precision cold-wound from high-tensile chrome-silicon wire, heat-treated, preset and 100% rate-tested, so the printed rate is the delivered rate. Lighter weight and more usable deflection than comparable springs, made in the USA.
Select your spring rate from the drop-down. Every spring in this listing shares the same 3.75″ I.D. and 20″ free length; only the rate and its associated deflection, load and coil dimensions change. All dimensions are shown in both inches and millimeters.
Rate Chart
| SKU | Rate (lbs/in) | Max Deflection | Max Load (lb) | Outside Dia. | Solid Height | Color |
|---|---|---|---|---|---|---|
| 1820G0200 | 200 | 14.034″ (356.5 mm) | 2807 | 4.92″ (125.0 mm) | 5.966″ (151.5 mm) | Silver |
| 1820G0250 | 250 | 13.673″ (347.3 mm) | 3418 | 4.992″ (126.8 mm) | 6.327″ (160.7 mm) | Silver |
| 1820G0300 | 300 | 12.792″ (324.9 mm) | 3838 | 5.08″ (129.0 mm) | 7.208″ (183.1 mm) | Silver |
| 1820G0350 | 350 | 12.781″ (324.6 mm) | 4474 | 5.124″ (130.1 mm) | 7.219″ (183.4 mm) | Silver |
| 1820G0400 | 400 | 12.272″ (311.7 mm) | 4909 | 5.186″ (131.7 mm) | 7.728″ (196.3 mm) | Silver |
| 1820G0450 | 450 | 11.636″ (295.6 mm) | 5236 | 5.25″ (133.3 mm) | 8.364″ (212.4 mm) | Silver |
Specifications
- Inside diameter: 3.75″ (95.2 mm)
- Free length: 20″ (508.0 mm)
- Series: G
- Rate range: 200–450 lbs/in
- Finish: Silver powder-coat
- 100% rate-tested, made in the USA
- Sold individually.






