Tyre geometry from a size

Code snippets

curl "https://api.oanor.com/tiresize-api/v1/dimensions" \
  -H "x-oanor-key: oanor_test_..."

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

$ch = curl_init("https://api.oanor.com/tiresize-api/v1/dimensions");
curl_setopt($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/tiresize-api/v1/dimensions",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

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

{
    "data": {
        "note": "Sidewall = width·aspect/100 (mm); overall diameter = rim·25.4 + 2·sidewall. 205/55R16 ≈ 631.9 mm (24.88 in) outside diameter.",
        "inputs": {
            "size": "205/55R16"
        },
        "revs_per_km": 503.7346,
        "aspect_ratio": 55,
        "revs_per_mile": 810.6822,
        "circumference_m": 1.985172,
        "rim_diameter_in": 16,
        "circumference_mm": 1985.1724,
        "section_width_mm": 205,
        "sidewall_height_mm": 112.75,
        "overall_diameter_in": 24.87795,
        "overall_diameter_mm": 631.9
    },
    "meta": {
        "timestamp": "2026-06-05T19:50:20.979Z",
        "request_id": "008af342-fa7d-412f-8501-428bfef7463e"
    },
    "status": "ok",
    "message": "Tyre dimensions",
    "success": true
}