Overview
A client-only toolkit for cyclists, combining a real-world power/gearing calculator with a computer-vision bike-fit analyzer. Every calculation runs entirely in the browser — no rider photo or ride data ever leaves the device. BikeMath is a power/watts calculator as much as a gear calculator. It models the three physical forces working against a rider — gravity on climbs, rolling resistance, and aerodynamic drag — then divides by drivetrain efficiency to estimate the watts you’d need to sustain a given speed.
Features
- Vector-based power model accounting for gradient, wind, tire pressure, and rider/bike weight.
- Full drivetrain simulation: gear ratios, development, cross-chain and chordal (polygon) effects.
- Live telemetry with alerts for chain tension, braking heat, cadence, torque, and bonk risk.
- Interactive gearing matrix, speed/cadence charts, and a tire-pressure optimizer.
- Garage system for saving multiple bikes and rider profiles, with side-by-side setup comparison.
- Shareable gear configs and exportable engineering reports.
- Computer-vision bike fit: upload two photos and place anatomical points to derive real joint angles.
- Automated fit diagnostics flagging knee, hip, and reach issues against target ranges.
- Interactive skeleton simulator to preview saddle height or crank-length changes before making them.
- Fit history with save/reload to track changes over time.
- Installable as an offline-capable PWA, local-first with optional cloud sync.
