AI Bike Fitting

AI Fitting is a fast, low-cost starting point. It uses computer vision to estimate your body's proportions from a single side-view photo, then cross-references those proportions against our database of 200+ frame geometries and component specs.

It is not a replacement for a professional bike fit. A good human fitter uses 3D motion capture, dynamic video, pressure mapping, and years of experience. AI Fitting gives you 70–80% of the value of a fitting at zero cost, in seconds.

1. Photo capture. Take a side-view photo of yourself on your current bike, pedals at 3 and 9 o'clock. Natural lighting helps.
2. Pose detection. Our model identifies 17 key body points: shoulders, elbows, wrists, hips, knees, ankles, and the bike's bottom bracket, saddle, and handlebar.
3. Geometry extraction. From the key points we compute your effective reach, drop, knee angle, hip angle, and torso angle.
4. Reference matching. We compare your angles against ideal ranges for your discipline (road, gravel, MTB) and recommend target stack, reach, stem length, saddle height, and setback.
5. Frame & component matching. We search our database of 200+ current model-year frames and find the size that best matches your target geometry.
6. Report delivery. You get a PDF report with measurements, recommendations, and 3–5 specific frame and component candidates.

• One side-view photo of you on your bike, in cycling kit
• Your height, weight, and approximate inseam (cm)
• Your discipline (road, gravel, MTB, commuter)
• Your flexibility level (low / medium / high) — sit and reach test
• Any current pain points (knees, back, hands, sit bones)

A personalized report covering:

• Target stack and reach for your discipline (matched against your current bike)
• Saddle height and setback recommendations
• Stem length recommendation
• Saddle width estimate based on your hip measurements
• 3–5 frame candidates with model, size, and price (with affiliate links where applicable)
• Fit issue flags — e.g., "your current stem is 20 mm too long for your torso length"

Validation against a sample of 200 professional fitter recommendations shows our AI Fit is within ±5 mm on stack and reach, ±10 mm on saddle height, and ±5° on joint angles. For most riders, this is more than enough to pick a frame size and order components confidently.

The model is less accurate for:

• Extreme body proportions (very tall / very short)
• Significant limb-length discrepancies
• Adaptive athletes (amputees, para-cyclists)
• Custom or hand-built frames outside our database

Go to a professional fitter when:

• You have persistent pain that AI recommendations didn't solve
• You're spending $5,000+ on a new bike or components
• You race and every watt matters
• You have a complex medical history (injuries, surgeries)
• You're new to cycling and have no baseline measurements

AI Fitting is the free first step. A professional fitting is the $200–$500 second step. Both have value.