Chain length from sprockets & centre

Extraits de code

curl "https://api.oanor.com/chaindrive-api/v1/chain-length" \
  -H "x-oanor-key: oanor_test_..."

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

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

Exemple de réponse

Une réponse réelle de ce endpoint, capturée lors du dernier contrôle de santé.

{
    "data": {
        "note": "Chain length in pitches = 2·C + (N1+N2)/2 + ((N2−N1)/2π)² ÷ C, with C the centre distance in pitches — then round UP to an even number so the chain closes without an offset link. The slack side should sag on the bottom; if you can't get an even count at the exact centre, nudge the centre distance or add a tensioner.",
        "inputs": {
            "pitch_in": 0.5,
            "driven_teeth": 34,
            "driver_teeth": 17,
            "center_distance_in": 15
        },
        "exact_pitches": 85.74,
        "chain_length_in": 43,
        "chain_length_pitches": 86
    },
    "meta": {
        "timestamp": "2026-06-06T23:53:58.407Z",
        "request_id": "b31b466d-b076-4dec-a898-9bcea2016ce1"
    },
    "status": "ok",
    "message": "Chain length",
    "success": true
}