Spring rate for a target frequency

Code snippets

curl "https://api.oanor.com/suspension-api/v1/spring-rate" \
  -H "x-oanor-key: oanor_test_..."

await fetch("https://api.oanor.com/suspension-api/v1/spring-rate", {
  headers: { "x-oanor-key": "oanor_test_..." }
});

$ch = curl_init("https://api.oanor.com/suspension-api/v1/spring-rate");
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$out = curl_exec($ch);

import requests
requests.get(
    "https://api.oanor.com/suspension-api/v1/spring-rate",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

A real response from this endpoint, captured by the latest health check.

{
    "data": {
        "note": "Spring rate for a target frequency = (2πf)² × corner weight ÷ g, then divided by motion ratio² to get back to the spring. Pick the frequency for the car's job (street ~1.3–1.7 Hz), then this gives the spring. Heavier corners need stiffer springs for the same frequency.",
        "inputs": {
            "motion_ratio": 0.7,
            "corner_weight": 500,
            "ride_frequency_hz": 1.5
        },
        "required_wheel_rate": 115.03,
        "required_spring_rate": 234.76
    },
    "meta": {
        "timestamp": "2026-06-06T23:54:02.274Z",
        "request_id": "fe119144-f6d2-443d-9d0d-011f67469fa4"
    },
    "status": "ok",
    "message": "Spring rate",
    "success": true
}