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Automotive Gear RPM Calculator
x402
Automotive Gear RPM Calculator is a paid API for AI agents from automotive-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).
Calculates engine RPM at a given road speed (or speed at a given RPM) based on tire size, axle ratio, and transmission gear ratios, returning a per-gear table.
Price / call$0.02
Success—
StatusUnknown
How this service works
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.
Output
Returns a JSON object containing the calculated road speed or engine RPM, a per-gear table showing each gear name, gear ratio, overall ratio, and RPM at the given speed (or speed at the given RPM), plus the tire diameter in inches, axle ratio used, speed unit, a summary string, and any disclaimer or degraded-data flags.
Example use cases
Highway cruise RPM after axle swap
“I just swapped to 4.10 gears on my Jeep with 35-inch tires and a 6-speed transmission with ratios 1:4.46, 2:2.61, 3:1.72, 4:1.25, 5:1.00, 6:0.84 — what RPM will I be cruising at in 6th gear at 65 mph?”
Speed at redline for each gear
“My motorcycle engine redlines at 10500 RPM, it has a 120/70R17 front tire effectively 23.5 inches diameter, a final drive ratio of 2.88, and gears 1:2.46, 2:1.75, 3:1.33, 4:1.07, 5:0.89, 6:0.79 — what speed in mph will I be doing at redline in each gear?”
Tire size effect on cruising RPM
“I'm upsizing my tires from 225/65R17 to 265/70R17 on a truck with a 3.55 axle ratio and a single overdrive gear ratio of 0.70 — what will my highway RPM be at 75 mph before and after the tire change?”
Technical details
Endpoint
GEThttps://automotive-calc.x402tookit.com/gear-rpm?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need precise drivetrain RPM-to-speed or speed-to-RPM calculations based on actual tire size, axle ratio, and multi-gear transmission ratios. Ideal for automotive enthusiasts, mechanics, or fleet managers evaluating gear swaps, tire upsizing, or engine operating ranges across all gears simultaneously.
Side effects
- Missing required tire or axleRatio parameters returns a validation error
- Malformed tire size string (e.g. not in NNN/NNRNN format or plain inches) may cause a parse error
- Neither speed nor rpm provided causes ambiguous or error response
- Axle ratio outside 1–8 range may produce invalid results
- Gear ratio string not formatted as 'gear:ratio; gear:ratio' may fail to parse
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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