# Services from bike-calc.x402tookit.com on Zero

> bike-calc.x402tookit.com serves 8 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/bike-calc.x402tookit.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/bike-calc.x402tookit.com/health.json

## Services

- [Bicycle Gear Table Calculator](https://www.zero.xyz/c/bicycle-gear-table-calculator-1939776e/llms.txt): $0.02/call via x402. Returns a full gear-inch and speed table for every chainring/cog combination in a drivetrain, including range, step percentages, and duplicate gears.
- [Bicycle Chain Length Calculator](https://www.zero.xyz/c/bicycle-chain-length-calculator-0b87ae06/llms.txt): $0.02/call via x402. Calculates the required bicycle chain length in links (rounded up to the nearest even number) from chainstay length, chainring teeth, and rear cog teeth.
- [Bicycle Gearing & Fit Calc – Cadence for Speed](https://www.zero.xyz/c/bicycle-gearing-fit-calc-cadence-for-speed-de2d7b53/llms.txt): $0.02/call via x402. Calculates the cadence needed to hold a target speed in a given gear, or the chainring-to-cog ratio needed to reach a target speed at a given cadence.
- [Bicycle Gear Ratio & Speed Calculator](https://www.zero.xyz/c/bicycle-gear-ratio-speed-calculator-5066c7ba/llms.txt): $0.02/call via x402. 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.
- [Bicycle Saddle Height Calculator (LeMond & Hamley Rules)](https://www.zero.xyz/c/bicycle-saddle-height-calculator-lemond-hamley-rules-bba32d15/llms.txt): $0.02/call via x402. Calculates recommended starting saddle height from inseam using the LeMond (×0.883) and Hamley (×1.09) formulas, plus the Holmes knee-angle range check.
- [Bicycle Frame Size Calculator](https://www.zero.xyz/c/bicycle-frame-size-calculator-19ca4455/llms.txt): $0.02/call via x402. Estimates bicycle frame size (seat tube in cm and S/M/L letter size) from inseam measurement and bike type, with an optional height-based letter size cross-check.
- [Bicycle Wheel Size Calculator](https://www.zero.xyz/c/bicycle-wheel-size-calculator-50763d8c/llms.txt): $0.02/call via x402. Returns rolling circumference, diameter, and revolutions per km for a given tyre size, either from a preset tyre label or from rim bead seat diameter and tyre width.
- [Bicycle Climb Gradient & VAM Calculator](https://www.zero.xyz/c/bicycle-climb-gradient-vam-calculator-1ceaf0dc/llms.txt): $0.02/call via x402. Calculates gradient percent and angle from rise and distance, plus climbing rate (VAM) and time to climb at a given rate.

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

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