{"uid":"cap_7Iyqba67ZjRyzEFKrp1op","slug":"bicycle-saddle-height-calculator-lemond-hamley-rules-bba32d15","name":"Bicycle Saddle Height Calculator (LeMond & Hamley Rules)","description":"Starting saddle height from inseam by the LeMond (0.883) and Hamley (1.09) rules, plus the Holmes knee-angle check.","url":"https://bike-calc.x402tookit.com/saddle-height?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["inseam"],"properties":{"unit":{"type":"string","description":"cm (default) or in"},"inseam":{"type":"number","description":"Inseam length (crotch to floor, barefoot)"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","properties":{"asOf":{"type":["null","string"]},"source":{"type":["null","string"]},"reasons":{"type":["array","null"],"items":{"type":"string"}},"summary":{"type":["null","string"]},"verdict":{"type":["null","string"]},"degraded":{"type":["boolean","null"]},"hamleyCm":{"type":["null","number"]},"inseamCm":{"type":["null","number"]},"lemondCm":{"type":["null","number"]},"disclaimer":{"type":["null","string"]},"notChecked":{"type":["array","null"],"items":{"type":"string"}},"hamleyInches":{"type":["null","number"]},"inseamInches":{"type":["null","number"]},"lemondInches":{"type":["null","number"]},"stepAdjustMm":{"type":["array","null"],"items":{"type":"number"}},"hamleyMinusLemondCm":{"type":["null","number"]},"holmesTargetKneeAngleDegrees":{"type":["array","null"],"items":{"type":"number"}}}}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_-fnnvE_-rPFww07x_IH94","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Calculates recommended starting saddle height from inseam using the LeMond (×0.883) and Hamley (×1.09) formulas, plus the Holmes knee-angle range check.","exampleAgentPrompt":"My inseam is 84 cm — can you calculate my recommended starting saddle height using both the LeMond and Hamley methods, and tell me the Holmes knee-angle target range?","exampleUseCases":[{"title":"New bike setup for beginner cyclist","prompt":"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?"},{"title":"Imperial unit saddle height for US rider","prompt":"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?"},{"title":"Cross-checking fit after saddle adjustment","prompt":"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?"}],"resultDescription":"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.","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-29T13:08:14.660Z","isFirstParty":false,"canonicalSlug":"bicycle-saddle-height-calculator-lemond-hamley-rules-bba32d15"}