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A fictional rider · the real decision path
See a bike-fit analysis before you record
This public example shows what OpenBikeFit checks and what it refuses to conclude. It uses a generated pedalling sequence, not a person, a customer result or your device. Reading this page does not ask for a camera, an account or a saved measurement.
Starting the interactive demo creates a local session and asks for the adult/on-device consent shown by the fit tool. This page itself is only an explanation.
One example, three decision gates
A signal has to survive the next check
The sample fixture deliberately starts with a more flexed knee and then supplies a second generated condition. The useful result is not a single angle or a fit score: it is a traceable sequence of accepted input, repeated measurement and controlled comparison.
- 01Input
Can this side view be measured?
The fictional rider is filmed from the side. The analysis checks framing, visibility, stability and usable pedalling cycles before reporting joint angles. Poor input is a reason to record again, not a reason to make a bike change.
- 02Repeat
Does a second take agree?
Several cycles give an angle range rather than one flattering frame. The unchanged setup needs an independent take; disagreement asks for another recording instead of selecting the most convenient number.
- 03Re-check
What changed after one trial?
The synthetic before condition starts more knee-flexed than its illustrative reference band. A separate after condition moves into that band. The comparison is shown with observed variation, not a claim that the same change suits another rider.
These are the tested synthetic scenario's qualitative states, not a live result. The real camera path may reject a clip or withhold a recommendation when quality, repeatability or safety conditions are not met.
Read the output
What you can take from it
A usable analysis separates the physical setup you recorded from estimates made by a 2D camera. It shows the movement range across multiple pedal cycles, the quality of the view and how much independent takes agree. Reference bands give context for a small, reversible question to test; they are not a universal prescription.
If you change one bike coordinate, measure it against the same physical reference, keep the camera protocol comparable and record another condition. The re-check can report whether a movement difference exceeds observed noise. It cannot prove what caused that difference or whether the new setup is better for you.
Do not infer
No verdict from one frame
A camera cannot diagnose pain, judge medical safety or promise performance. Clothing, lens position, occlusion, cadence and pose-estimation error can change a displayed angle. A reference interval drawn from published research may not describe an individual rider. If a symptom or injury is involved, this educational tool is not the right decision-maker.
OpenBikeFit deliberately refuses low-quality side views and asks for repeatable evidence before suggesting a hardware trial. The evidence and methodology page lists each active claim, source and limitation.
Choose your next step
Explore first, then use your own measurements
Run the interactive synthetic demo to inspect the actual report and re-check flow without a camera or trainer. Or use the free calculator to record a measured starting point before trying the camera workflow. Both paths stay on your device; neither sends a fit record to OpenBikeFit.