Does it work without a smart trainer?

Yes. A basic trainer is enough; it only needs to hold the bike still in the frame.

Which bikes are supported?

Road, triathlon/aero and mountain bikes, each with its own ranges.

A bike fit app for Android: your position from a short video

Most of what a bike fitter checks can be seen from the side while you pedal: the knee angle at the bottom of the stroke, hip and back angle, and where the knee sits over the pedal. BikeFit AI measures these from a video you film at home and turns them into clear advice.

What you can check at home

Saddle height: the knee should be slightly bent at the bottom of the stroke. For road riding the app's ideal knee angle there is about 140–150°.
Saddle fore-aft: knee over the pedal spindle at the 3 o'clock position (on tri/TT bikes this is only a reference).
Hip and back angle, which tell you whether the reach and handlebar height suit you.

How BikeFit AI measures you

Film 20–40 seconds of pedalling from the side on a trainer, full body in view, camera at about bottom-bracket height.
Angles are the median of many pedal strokes (up to 15 for the knee) with outliers removed, and a confidence score shows how many strokes agree.
Mark the wheel hubs, bottom bracket and saddle once and saddle height and knee-over-pedal come out in centimetres.
Advice is specific to road, triathlon/aero or MTB and uses three zones: ideal, borderline, change something.
Every measurement is drawn on the frame it came from, the video is deleted after the analysis, and you get a PDF report in 10 languages.

Analyse your position Android app on Google Play

FAQ

Does it work without a smart trainer?: Yes. A basic trainer is enough; it only needs to hold the bike still in the frame.
Which bikes are supported?: Road, triathlon/aero and mountain bikes, each with its own ranges.

If you have pain while riding, see a physiotherapist or a professional bike fitter.

Built by Onur Kapucu, Ironman triathlete and coach. CoachOnur AI