Gear ratio speed calculator

Open Gear ratio speed calculator on Happytails.ai. This view has the same page content and links, with explicit tool capabilities. Read the processing notes before using a tool.

Tool capabilities

{
  "id": "gear-ratio-speed-calculator",
  "category": "calculators",
  "built": true,
  "requirements": "Use positive transmission and final-drive ratios up to 100, circumference from 100 to 10000 mm, engine-speed input from 0 to 100000 RPM and speed input from 0 to 2000 in the selected unit. Decimal inputs allow up to six places. These are software bounds, not vehicle capability claims. Results use floating-point arithmetic. Processing stays on your device, with a bounded worker and a 10-second timeout. Full JSON and CSV preserve every calculated row and the assumptions. Do not use thousands separators.",
  "implementation": {
    "fields": [
      {
        "key": "direction",
        "label": "Calculate",
        "value": "rpm-to-speed",
        "type": "select",
        "values": [
          "rpm-to-speed",
          "speed-to-rpm"
        ],
        "labels": {
          "rpm-to-speed": "Speed from RPM",
          "speed-to-rpm": "RPM from speed"
        }
      },
      {
        "key": "engineRpm",
        "label": "Engine speed (RPM)",
        "value": "3000",
        "type": "text",
        "inputMode": "decimal",
        "maxLength": 24,
        "showWhen": {
          "direction": [
            "rpm-to-speed"
          ]
        }
      },
      {
        "key": "speed",
        "label": "Road speed",
        "value": "45",
        "type": "text",
        "inputMode": "decimal",
        "maxLength": 24,
        "showWhen": {
          "direction": [
            "speed-to-rpm"
          ]
        }
      },
      {
        "key": "speedUnit",
        "label": "Speed unit",
        "value": "km/h",
        "type": "select",
        "values": [
          "km/h",
          "mph"
        ],
        "labels": {
          "km/h": "Kilometers per hour",
          "mph": "Miles per hour"
        },
        "showWhen": {
          "direction": [
            "speed-to-rpm"
          ]
        }
      },
      {
        "key": "transmissionRatio",
        "label": "Transmission reduction ratio",
        "value": "2",
        "type": "text",
        "inputMode": "decimal",
        "maxLength": 24
      },
      {
        "key": "finalDriveRatio",
        "label": "Final-drive reduction ratio",
        "value": "4",
        "type": "text",
        "inputMode": "decimal",
        "maxLength": 24
      },
      {
        "key": "circumferenceMm",
        "label": "Rolling tire circumference (mm)",
        "value": "2000",
        "type": "text",
        "inputMode": "decimal",
        "maxLength": 24
      }
    ],
    "input": false,
    "presentation": "metrics",
    "note": "Use measured rolling tire circumference from 100 to 10000 mm. Transmission and final-drive ratios are positive reductions, each at most 100. Engine speed accepts 0 to 100000 RPM; road-speed input accepts 0 to 2000 in the selected unit. Results assume a locked drivetrain without clutch, torque-converter or tire slip. They do not predict whether the engine has enough power to reach that speed. Do not use thousands separators.",
    "experience": {
      "automatic": false,
      "single": false,
      "inputMaxLength": 1000000,
      "inputMode": "text",
      "label": "Your text",
      "placeholder": "Type or paste your input…",
      "help": "Up to 1,000,000 characters. Review the settings before running.",
      "helpParts": [
        "Up to 1,000,000 characters.",
        "Review the settings before running."
      ],
      "action": null
    },
    "mode": "explicit",
    "interactive": false
  },
  "execution": "Browser interface",
  "api": null,
  "browser_agent": {
    "supported": true,
    "name": "run_current_tool",
    "discovery": "WebMCP on the human page in a supporting browser",
    "verification": "See audit/API-AUDIT.md; availability is not verification"
  }
}

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