Saddle Height

{
  "asOf": "2026-10-12T01:50:57.710Z",
  "degraded": false,
  "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
  "hamleyCm": 87.2,
  "hamleyInches": 34.33,
  "hamleyMinusLemondCm": 16.6,
  "holmesTargetKneeAngleDegrees": [
    25,
    35
  ],
  "inseamCm": 80,
  "inseamInches": 31.5,
  "lemondCm": 70.6,
  "lemondInches": 27.81,
  "notChecked": [
    "flexibility, injuries and leg-length differences",
    "crank length and shoe/pedal stack, which move the right height by several mm",
    "…1 more"
  ],
  "reasons": [
    "Start at the LeMond figure, then adjust in 2 to 3 mm steps: the knee should keep about a 25 to 35 degree bend at the bottom of the pedal stroke (Holmes check).",
    "These formulas assume a road bike; use them only as a starting point."
  ],
  "source": "computed locally (LeMond: 0.883 x inseam; Hamley: 1.09 x inseam)",
  "stepAdjustMm": [
    2,
    3
  ],
  "summary": "For a 80 cm inseam, LeMond puts the saddle 70.6 cm from the bottom bracket centre along the seat tube to the saddle top; Hamley gives 87.2 cm from the pedal axle (pedal at its lowest).",
  "verdict": "COMPUTED"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://bike-calc.x402tookit.com/saddle-height?inseam=80&unit=cm'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - 'https://bike-calc.x402tookit.com/saddle-height?inseam=80&unit=cm' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.02 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.02" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.02 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fbike-calc.x402tookit.com%2Fsaddle-height
const res = await pay("https://bike-calc.x402tookit.com/saddle-height?inseam=80&unit=cm");
console.log(res.status, await res.text());

# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.02 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.02"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://bike-calc.x402tookit.com/saddle-height?inseam=80&unit=cm")
    print(res.status_code, res.text)