Engine RPM at a road speed (or speed at an RPM) from tire size, axle ratio and t
Engine RPM at a road speed (or speed at an RPM) from tire size, axle ratio and transmission gear ratios, with a table by gear.
Answers HTTP 429 without x402 payment termsour last check, 2026-10-21
0 of 1checks answered this week
n/amedian answer time
$0.02listed price per call
n/aprice it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
GET https://automotive-calc.x402tookit.com/gear-rpm
| Category | Everything else |
|---|---|
| Provider host | automotive-calc.x402tookit.com |
| Networks | eip155:137, eip155:42161, eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-21 | no x402 terms | 429 | 332 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"axleRatio": 3.73,
"gears": "1:3.59; 2:2.19; 3:1.41; 4:1.00; 5:0.83",
"speed": 60,
"tire": "26"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"axleRatio": {
"description": "Final drive (axle) ratio, 1 to 8, for example 3.73",
"type": "number"
},
"gearRatio": {
"description": "One transmission gear ratio (default 1, direct drive); use gears for several",
"type": "number"
},
"gears": {
"description": "Gear ratios as gear:ratio separated by semicolons, for example '1:3.59; 2:2.19; 3:1.41; 4:1.00; 5:0.83'",
"type": "string"
},
"rpm": {
"description": "Engine RPM, to find the speed instead",
"type": "number"
},
"speed": {
"description": "Road speed (give this, or rpm)",
"type": "number"
},
"speedUnit": {
"description": "mph (default) or kmh",
"type": "string"
},
"tire": {
"description": "Tire size like 265/70R17, or a diameter in inches like 28",
"type": "string"
}
},
"required": [
"tire",
"axleRatio"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"asOf": {
"type": [
"null",
"string"
]
},
"axleRatio": {
"type": [
"null",
"number"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"gears": {
"items": {
"properties": {
"gear": {
"type": [
"null",
"string"
]
},
"gearRatio": {
"type": [
"null",
"number"
]
},
"overallRatio": {
"type": [
"null",
"number"
]
},
"rpm": {
"type": [
"null",
"number"
]
}
},
"type": "object"
},
"type": [
"array",
"null"
]
},
"notChecked": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"reasons": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"source": {
"type": [
"null",
"string"
]
},
"speed": {
"type": [
"null",
"number"
]
},
"speedMph": {
"type": [
"null",
"number"
]
},
"speedUnit": {
"type": [
"null",
"string"
]
},
"summary": {
"type": [
"null",
"string"
]
},
"tireDiameterInches": {
"type": [
"null",
"number"
]
},
"verdict": {
"type": [
"null",
"string"
]
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}