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Bicycle Saddle Height Calculator (LeMond & Hamley Rules)
x402
Bicycle Saddle Height Calculator (LeMond & Hamley Rules) 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 recommended starting saddle height from inseam using the LeMond (×0.883) and Hamley (×1.09) formulas, plus the Holmes knee-angle range check.
Price / call$0.02
Success—
StatusUnknown
How this service works
Starting saddle height from inseam by the LeMond (0.883) and Hamley (1.09) rules, plus the Holmes knee-angle check.
Output
Returns the recommended saddle height in both cm and inches under both the LeMond (inseam × 0.883) and Hamley (inseam × 1.09) methods, the difference between the two, the Holmes target knee-angle range in degrees, suggested step adjustment values in mm, the original inseam in both units, and a disclaimer/summary. Also includes a verdict and degraded/not-checked flags.
Example use cases
New bike setup for beginner cyclist
“I just bought my first road bike and my inseam is 78 cm. What saddle height should I start with, and what's the difference between the LeMond and Hamley recommendations?”
Imperial unit saddle height for US rider
“My inseam is 31 inches — can you give me the LeMond and Hamley saddle height recommendations in inches, and include the Holmes knee-angle guidance?”
Cross-checking fit after saddle adjustment
“I moved my saddle up a bit and my inseam is 85 cm. Can you run the LeMond and Hamley saddle height calculations so I can see how far off I am from the formulas, and what knee angle I should be targeting?”
Technical details
Endpoint
GEThttps://bike-calc.x402tookit.com/saddle-height?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, formula-based starting saddle height recommendation from inseam alone, following the two most widely cited cycling fit rules (LeMond and Hamley), and want the Holmes knee-angle reference bundled in one call. Prefer this over a full professional bike-fit service when the user wants a self-service first estimate before visiting a fitter, or when building an automated bike-fit onboarding flow.
Side effects
- Missing required 'inseam' query parameter returns an error
- Non-numeric inseam value causes a validation failure
- Extremely small or large inseam values may produce physically implausible results
- Invalid unit value (anything other than 'cm' or 'in') may default to cm or error
- Payment failure (x402) prevents access to the endpoint
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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