Racing Formulas: Spring Height, Rate, Deflection & Load
Review the below formulas to properly evaluate spring performance in racing applications, or access our Spring Rate Calculator.
Solid Height | |
| Solid Height | = (Number ofCoils – 0.25) x Wire Diameter |
| For example, for a spring with 14 coils and a wire diameter of 0.5”, the Solid Height would be calculated as follows: | |
| Solid Height | = (14 – 0.25) x 0.5 = 6.875 |
Rate | |
| Rate | = Load (lbs.) ÷ Spring Deflection (in.) |
| For example, if a spring deflects by 2.75” under a load of 300 lbs, the Rate would be calculated as follows: | |
| Rate | = 300 ÷ 2.75 = 109 |
Deflection | |
| Deflection | = Load (lbs) ÷ Rate |
| For example, a spring under a load of 300 lbs with a 109 Rate, the deflection would be calculated as follows: | |
| Deflection | = 300 ÷ 109 = 2.75 |
Load | |
| Load | = Deflection x Rate |
| For example, a spring with a 109 Rate and a 2.75” deflection, the load would be calculated as follows: | |
| Deflection | = 2.75 ÷ 109 = 300 |
Combined Spring RateThis is used when two springs are stacked on top of each other. Combined Spring Rate = (Spring Rate ‘A’ x Spring rate ‘B’) ÷ (Spring Rate ‘A’+Spring Rate ‘B’) For example, if the rate for spring ‘A’ is 200 and the rate for spring ‘B’ is 500, the combined rate is calculated as follows: Combined Spring Rate = | |
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