Hyperco 3.75″ I.D. x 6″ Free Length Coilover Spring, G Series, 150-300 lbs/in Rate (Choose Rate)
$134.00
Hyperco 3.75″ I.D. x 6″ Free Length Coilover Springs — G Series

Hyperco high-performance G-series coilover springs in a 3.75″ (95.2 mm) inside diameter and 6″ (152.4 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 6″ 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 |
|---|---|---|---|---|---|---|
| 186G0150 | 150 | 4.733″ (120.2 mm) | 710 | 4.5″ (114.3 mm) | 1.267″ (32.2 mm) | Silver |
| 186G0200 | 200 | 4.618″ (117.3 mm) | 923 | 4.56″ (115.8 mm) | 1.382″ (35.1 mm) | Silver |
| 186G0250 | 250 | 4.547″ (115.5 mm) | 1136 | 4.606″ (117.0 mm) | 1.453″ (36.9 mm) | Silver |
| 186G0300 | 300 | 4.435″ (112.6 mm) | 1330 | 4.654″ (118.2 mm) | 1.565″ (39.8 mm) | Silver |
Specifications
- Inside diameter: 3.75″ (95.2 mm)
- Free length: 6″ (152.4 mm)
- Series: G
- Rate range: 150–300 lbs/in
- Finish: Silver powder-coat
- 100% rate-tested, made in the USA
- Sold individually.






