Technology
Science-Driven Bike Fitting
FitMetrix combines multi-camera 3D motion capture, real-time pose estimation, and an evidence-based rules engine to deliver objective, repeatable bike fits grounded in biomechanics — not guesswork.
Mechanistic Biomechanics
FitMetrix rules are grounded in mechanistic biomechanics rather than any single branded fitting methodology. Angle targets preserve clinically validated joint ranges of motion.
Age-Adjusted Targets
Built-in age adjustments account for documented physiological changes in flexibility, ensuring fit recommendations remain appropriate across the full spectrum of riders.
Saddle-Height-First Hierarchy
The adjustment hierarchy follows the principle that saddle height (knee extension) is foundational. All downstream adjustments are resolved only after the saddle position is optimized.
Methodology Agnostic
Consistent with best practices across IBFI, BikeFit, Retül, and independent fitting protocols — FitMetrix doesn't lock you into a single system.
Multi-Camera Motion Capture
Four Time-of-Flight cameras deliver high-fidelity depth and RGB data from every angle. Each camera tracks 33 body landmarks in real time, yielding 132 landmark observations per frame.
33
Body Landmarks per Camera
Full skeletal model covering every major joint from ankle to wrist.
4×
Camera Views
Multi-angle coverage eliminates blind spots and self-occlusion artifacts.
Kalman
Smoothed Output
Temporal filtering removes frame-to-frame jitter for stable, reliable metrics.
| Specification | Detail |
|---|---|
| Cameras | 4× Time-of-Flight (ToF) |
| RGB Resolution | 3840 × 2160 (4K) @ 30 FPS |
| Pose Input Resolution | 1920 × 1080 RGB |
| Body Landmarks | 33 per camera (132 total) |
7 Real-Time Biomechanical Metrics
Kalman-smoothed and percentile-gated across frame samples, these seven metrics form the backbone of every FitMetrix fit session.
Knee Extension Angle
Measured at bottom dead center of the pedal stroke. Foundational metric — saddle height adjustments are always resolved first.
Knee Flexion Angle
Measured at top dead center. Ensures adequate clearance and prevents impingement at the hip-knee chain.
Hip Angle
Torso-to-femur angle at the hip joint. Governs reach and comfort while protecting lower-back range of motion.
Ankle Angle
Dorsiflexion/plantarflexion through the pedal stroke. Detects excessive toe-pointing or heel-dropping patterns.
Shoulder Angle
Upper-arm position relative to the torso. Indicates whether the rider is over-reaching or too compressed on the bars.
Knee Tracking
Frontal-plane deviation of the knee relative to the pedal spindle. Flags valgus or varus alignment issues.
Trunk Angle
Inclination of the rider's torso relative to horizontal. Balances aerodynamics against sustainable comfort.
Evidence-Based Rules Engine
The FitMetrix rules engine is built on established biomechanical principles from professional bike fitting practice. It processes the seven real-time metrics, applies age-adjusted target ranges, and surfaces actionable recommendations in a clear adjustment hierarchy.
Capture & Filter
Raw landmark data from all four cameras is Kalman-smoothed and percentile-gated to produce stable biomechanical measurements.
Evaluate Against Targets
Each metric is compared to clinically validated angle ranges, adjusted for the rider’s age and flexibility profile.
Generate Ordered Recommendations
Adjustments are prioritized following the saddle-height-first hierarchy, ensuring foundational positions are resolved before reach, bar height, and cleat refinements.
See the Technology in Action
Schedule a demo to experience real-time motion capture and biomechanical analysis firsthand.