AxyZ is an AI-powered bike fit analysis tool that uses a 10-second side-view video of your ride to score saddle height, hip angle, upper body posture, and pedaling stability. It delivers a prioritized adjustment report in under 2 minutes, replacing expensive in-person bike fitting sessions — which typically cost $150–$400 — with automated analysis from any smartphone.

How does AI bike fitting work?

AxyZ uses computer vision to analyze a short video of you riding. The AI tracks your joint positions frame-by-frame across a full pedal cycle, measuring angles at the knee, hip, and torso. It compares your measurements against established bike fitting benchmarks — such as 25–35 degrees of knee flexion at bottom dead center — and generates a scored report with prioritized adjustments.

What is the correct saddle height for cycling?

The correct saddle height for cycling positions the knee at 25–35 degrees of flexion at the bottom of the pedal stroke (bottom dead center). A saddle that is too low causes excessive knee flexion and anterior knee pain; too high causes hip rocking, IT band strain, and reduced power transfer. AxyZ measures your actual knee angle from video and flags deviations from this range.

How do I film myself for a bike fit analysis?

Set your phone level with your pedals, approximately 6–10 feet away from the bike. Film from the right side so your full body is in frame. Record at least 10 seconds of steady riding — no sudden movements. You do not need any special equipment; a smartphone propped against a water bottle or leaned against a wall works well.

How accurate is video bike fitting?

AxyZ uses MediaPipe pose estimation to track joint angles frame-by-frame, the same computer vision foundation used in professional sports analysis. Accuracy depends on video quality and camera placement — a stable, level, side-on view at 6–10 feet produces the most reliable measurements. AxyZ is designed as a directional tool: it identifies which adjustments will have the highest impact, giving you a science-backed starting point rather than a final prescription.

How much does AxyZ cost?

AxyZ offers a free tier with limited analyses and a Pro subscription starting at $2.99 per month. A Founding Member rate is available for early adopters. All plans include full access to the AI bike fit report, saddle height scoring, hip angle measurement, posture analysis, and prioritized adjustment recommendations.

What bike types does AxyZ support?

AxyZ supports road bikes, gravel bikes, mountain bikes, triathlon bikes, and indoor training setups. The analysis works for any bike ridden in a side-view position. The upload form asks for your bike type and crank length so the AI can calibrate angle measurements to your specific setup.

How long does an AxyZ analysis take?

AxyZ delivers your full bike fit report in under 2 minutes from the time you upload your video. The upload itself takes 10–30 seconds depending on your connection speed. The AI processes the video and returns scored metrics with prioritized recommendations in under 90 seconds.

What measurements do I need before uploading?

You need your rider height in centimeters and your crank length in millimeters (typically printed on the crank arm — common sizes are 165mm, 170mm, 172.5mm, and 175mm). Inseam length is optional but improves saddle height calibration. Discomfort notes (knee pain, back pain, hand numbness) are also optional and help AxyZ prioritize its recommendations.

Is AxyZ a replacement for a professional bike fit?

No — AxyZ is a complement to professional fitting, not a replacement. A professional bike fitter uses 3D motion capture, pressure mapping, and physical assessment over 1–3 hours. AxyZ provides a directional read on your four most impactful fit variables — saddle height, hip angle, torso lean, and pedaling stability — in under 2 minutes. It is designed for riders who want a science-backed starting point, a quick check after a bike change, or an affordable option before booking a full fitting.

What causes knee pain when cycling?

Knee pain in cyclists is most commonly caused by incorrect saddle height. A saddle set too low forces the knee into excessive flexion at the bottom of the pedal stroke, stressing the patella and causing anterior knee pain. A saddle set too high creates lateral hip rocking, which strains the IT band and causes pain on the outside of the knee. Cleat misalignment and pedaling asymmetry are also common causes. AxyZ measures your knee angle and hip stability to identify which of these factors may be contributing to your discomfort.

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AxyZ Pro

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✓Unlimited bike fit analyses
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