curl --request POST \
  --url https://api.iotools.cloud/v1/tool/bicycle-gear-ratio-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "chainringTeeth": "50",
  "cogTeeth": "17",
  "wheelSize": "700c",
  "customWheelDiameter": ""
}
'

{
  "tool": "bicycle-gear-ratio-calculator",
  "tool_version": "1.0.1",
  "outputs": {
    "results": [
      {
        "metric": "Gear Ratio",
        "value": "2.94"
      },
      {
        "metric": "Gear Inches",
        "value": "79.41″"
      },
      {
        "metric": "Wheel Circumference",
        "value": "7.07 ft (2.15 m)"
      },
      {
        "metric": "Development (per pedal revolution)",
        "value": "20.79 ft (6.34 m)"
      }
    ]
  },
  "credits_used": 3,
  "credits_remaining": null
}