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Bicycle Gear Ratio & Speed Calculator
x402
Bicycle Gear Ratio & Speed Calculator is a paid API for AI agents from bike-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).
Calculates gear ratio, gear inches, development per pedal turn, and speed at a given cadence for a specific chainring and cog combination on a bicycle wheel.
Price / call$0.02
Success—
StatusUnknown
How this service works
Gear ratio, gear inches, development per pedal turn and speed at a cadence for a chainring and cog on a given wheel.
Output
Returns the gear ratio (chainring/cog), gear inches (effective wheel diameter driven per crank revolution), development in meters (distance per pedal stroke), speed in both km/h and mph at the specified cadence, meters per minute, and the wheel circumference and diameter used in the calculation.
Example use cases
Road bike high gear speed check
“I'm running a 53 chainring and an 11-tooth cog on 700x25c wheels — what's my gear ratio, gear inches, and how fast will I be going if I'm spinning at 95 rpm?”
Fixed gear urban commuter setup
“For a fixed gear bike with a 44-tooth chainring and a 16-tooth cog on 700x23c tyres, what's the gear development in meters per pedal stroke and my speed at 85 rpm?”
Gravel bike climbing gear analysis
“What are the gear inches and speed for a 34-tooth chainring paired with a 32-tooth cog on 700x38c gravel tyres at a cadence of 75 rpm?”
Technical details
Endpoint
GEThttps://bike-calc.x402tookit.com/gear-ratio?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need precise single-gear-combination calculations including gear ratio, gear inches, development, and speed at cadence. It is ideal for evaluating a specific chainring/cog pairing before a ride or when building a gear recommendation tool. Prefer the full drivetrain matrix endpoint (sibling) if you need all combinations across a cassette at once.
Side effects
- Missing required chainring or cog parameters returns an error
- Non-integer chainring or cog values cause validation failure
- Unrecognised tyre preset string falls back to default 700x25c or may error
- Cadence of 0 or negative values may produce nonsensical speed outputs
- Providing both diameterInches and circumferenceMm may cause ambiguity — only one override should be used
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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