BikeFit AI
Side-view trainer video in. Multi-cycle angles, measurement consistency, and a confidence score out.
Three signals you get on every analysis — not marketing claims.
We track many revolutions so BDC/TDC angles reflect a pattern, not one lucky still.
Consistency across cycles becomes a score you can use to keep or re-record a session.
Aero guidance for hip, torso, and elbow stays separate from road heuristics.
Most consumer bike-fit tools treat triathlon as one of several preset rider types. That often means aero geometry — high hands, forward saddle / steep STA, flat torso — gets scored with road-bike heuristics. The result can look “correct” on a single still while missing cycle-to-cycle consistency and triathlon-specific ranges.
Capture a side-view video while pedaling indoors. Stable framing improves BDC/TDC detection.
We locate bottom and top dead centre frames and aggregate angles over multiple pedal revolutions — typically in the 8–20 cycle range when the clip is long enough.
You get joint feedback tied to published knee ranges and coaching consensus for aero posture, plus a consistency score so you can see how stable the measurement was.
See how our multi-cycle coordinates tracking measures key anatomical angles across different riding styles.
Precise tracking of knee angle at the top and bottom stroke on a tri bike to optimize aerobar contact and power output.
Anatomical angle overlays (hip, knee, ankle, shoulder, elbow) in real-time to prevent fatigue and lower back discomfort.
These baseline physical dimensions form the foundation of our ideal bike fit calculations.
Shows how many cycles were scanned and how much BDC knee angles varied (standard deviation). A high score means the reported angle is repeatable — not a lucky single frame.
Knee (BDC): Holmes / Bini / Ferrer-Roca. Hip, torso, elbow (aero): F.I.S.T. protocol and triathlon coaching standards — kept as separate evidence categories. Methodology →
Shin/thigh pixel ratio at BDC is stored per session. Over time it supports personalized saddle/cleat context instead of one-size anthropometry assumptions.
Off-axis camera angle is a common source of fit error. Calibration checks flag wheel/hub geometry that suggests the bike is not square to the lens.
We use single-camera 2D pose estimation. For complex orthopedic conditions such as leg length asymmetry or scoliosis, we recommend visiting a professional fit studio.
Built by Onur Kapucu — triathlon coaching background combined with software engineering. BikeFit AI is a practical tool for measuring position on a trainer, not a marketing claim about replacing a full studio fit.
Age-group Triathlete
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Ironman Finisher
"Placeholder: Marcus's feedback on aero position adjustments will be added here..."
Amateur Cyclist
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Credit-based access for web analysis. Credits do not expire.
1 Coach Review + 5 Analysis Credits
In addition to AI analysis, triathlon coach Onur Kapucu personally reviews your fit results and sends a custom video/written evaluation.
Request Coach ReviewKnee pain is often caused by an incorrect saddle height. Learn how to keep your joints healthy using evidence-based parameters.
Read article →Getting low is fast, but only if you can sustain the position. Find your optimal balance for a strong run leg.
Read article →A stationary trainer (smart or basic) is recommended so the bike stays fixed in frame. Bluetooth power/cadence is optional telemetry, not required for angle analysis.
A typical clip is ~20–40 seconds of pedaling after you’re on the bike. Processing on the analysis backend usually finishes within about a minute depending on length and load.
Road and triathlon / TT modes. Triathlon mode uses aero-specific torso, hip, and elbow guidance; road mode uses road ranges.
Side view, full body visible, camera roughly level with the bottom bracket, bike square to the lens. Mark hubs / BB / saddle in calibration when you want cm saddle and KOPS.
It summarizes measurement consistency across detected pedal cycles (count + variability). Use it to decide whether to trust a single session or re-record with a longer, cleaner clip.
Yes. If you experience any technical issues or the analysis results do not meet your expectations, simply send an email to onur@trihonor.com within 14 days of purchase for a full refund.
Reach out for support, refunds, or coach-review questions.