How it works
What Bike Fit actually does
A bike fit normally means a studio appointment, a few hundred dollars and half a day. This measures the same joint angles from a video you record yourself, in about four minutes. Here's the whole thing, including the parts it can't do.
The loop, end to end
Three steps, and you only do the first one.
Record and upload
Prop your phone side-on and pedal for 10–20 seconds. Upload the clip you already have — there's no in-browser camera capture to fight with.
We measure it
Your pose is extracted frame by frame and turned into joint angles across the whole pedal stroke — not a single snapshot at one crank position.
You get findings
A ranked list of what's off, with the specific adjustment for each one. Saved to your history so you can compare before and after.
What gets measured
Angles at the extremes of the pedal stroke are what fit is judged on, so those are what the analysis reports — measured across every stroke in your clip, then summarised, so one odd pedal revolution doesn't decide your fit.
- Knee angle at the bottom of the stroke — the primary saddle-height signal.
- Hip angle — how closed your position is, which drives saddle fore-aft and comfort over distance.
- Back angle — your reach and drop, and the usual suspect behind neck and lower-back complaints.
- Elbow angle — whether your reach is genuinely too long, or your bars are just too low.
- Knee tracking and pelvic tilt — only from an optional second clip shot head-on; a side-on camera physically cannot see them.
What the report looks like
Not a wall of numbers. Each finding says what's off, by how much, and the one adjustment that addresses it — ordered so the thing worth doing first is at the top.
What you need before you start
- A bike on a turbo trainer, or on rollers — you need to pedal in one place.
- A phone, and something to stand it on. You don't hold it.
- Your height, and your inseam if you know it. Both feed into the analysis.
- About four minutes, most of which is the recording.
The recording itself has rules, and they matter more than anything else on this page — read the capture guide before your first scan.
What it costs
Five scans free, then $10 for five more. No subscription, nothing to cancel, and bought scans never expire.
Five is deliberate rather than arbitrary: one to establish where you are, then one after each adjustment you make. That's a full fitting cycle before you pay anything.
What it doesn't do
Worth being straight about, because it decides whether this is the right tool for you.
- It isn't a medical assessment. Persistent pain is a physio's job, not a camera's.
- It doesn't measure your frame in millimetres. It measures you, on your bike — saved bike measurements refine the analysis, they aren't a geometry lookup.
- It doesn't replace a professional fitter for a competitive position or a complicated injury history. It gets most riders most of the way, for free.
Your video
It's deleted right after analysis. If you opt in — separately, and off by default — a face-blurred copy is kept to improve the analysis for everyone, and you can withdraw that and delete what was kept at any time from your profile.