Bike Fast Fit
A Real Bike Fit, From Your Phone.
From slow-motion video, Bike Fast Fit analyzes how you pedal on your bike and recommends adjustments to optimize your fit. Three apps take you from a quick self-check at home to a full professional fitting platform.
…my Retul motion capture system sits in the drawer. Your software is much better and faster!!!
Meet the family
The BFF family of apps
One method, three levels
You never start over.
Each app does everything the one before it does, and adds to it. Move up whenever you want more.
Starts with
- Saddle height
- Saddle fore and aft
- Upper body position
- Side view, markerless
EZ You are fitting your own bike and want a straight answer. One-week free trial, then $4.99 / yr Adds
- Front view
- The full measurement suite
- Your real crank length
- What-if before you move anything
- PDF and video reports
Elite You want the whole picture, not just the big three. $19.99 / yr Adds
- Rear view
- Live readout while they ride
- Rider and bike records
- Before and after reports
- Your own branding
Pro You fit other people: a studio, a shop, or clients. $99.99 / yr 
Always free · no signup
BFF Academy teaches you all of the above.
Free lessons on what each number means and what to change on the bike. The EZ track is live now; Elite and Pro are coming.
The app at work
Point your phone. Pedal. Get your numbers.
This is the actual recording screen: markerless tracking locked onto a rider, no dots, no sensors, no studio.
240 fps slow motion. Fast enough to catch the exact frame where your knee reaches maximum extension.
How it works
Where the numbers come from
Most fit tools hand you one acceptable range per measurement. That hides the part that matters, because your joint angles are not independent of each other. Raise your heel. The knee angle moves with it, and nothing on the bike has changed. Check each number on its own, and you can land inside every range and still be in a position that is working against you.
So we do not read them on their own. Bike Fast Fit measures your joint angles from slow-motion video and places you in a region that accounts for how those angles move together. We drew that region around several hundred real fitting sessions from our own database, taking the setup each fitter settled on at the end. It reflects positions that working fitters accepted, not a number copied out of a reference book.
That database now holds more than 1.15 million rider videos, as of July 2026, and it grows every day. It is also why the targets are not frozen. When riders start doing something different, we have enough video to notice.
What we are looking at now
Saddle height is the question we hear most, and knee angle alone does not always settle it. We are working through what else in a pedal stroke points to a saddle set too high or too low, from how steady the stroke is to where the movement concentrates when it is not.
Some of what we look at does not survive testing. We would rather find that out ourselves than ship it and let you find it.
None of this changes what the app tells you today. It is how we decide what to look at next.
Bike Fast Fit EZ
A four-second video of you pedaling. No markers, no studio, no appointment.
- Saddle height, fore-aft, position
- Just your phone, no markers
- A dashboard you flip through
- Read at Maximum Knee Extension
Want to learn it first? Open the EZ track in the Academy. It is free.
Bike Fast Fit Elite
The full self-fitting toolkit, for serious cyclists and amateur fitters.
- Front view and Bike Measurements
- The full side-view measurement suite
- Analysis tools and Explore Possible Changes
- Reports and user-entered crank length
Want to learn it first? Open the Academy in the Academy. It is free.
Bike Fast Fit Pro
The professional fitting platform, built for fitters and bike shops.
- Rear view and LiveCheck
- Riders, bikes, and sessions
- Marker override, BDC switch, and more
- Comparison reports and custom branding
Want to learn it first? Open the Academy in the Academy. It is free.
Find your fit
Which app is right for you?
Three quick questions. We will point you to the app that matches how you ride and who you are fitting.
Rather not answer questions? Compare all three side by side.
We have been reading pedal strokes since 2012.
The method has not changed. The camera in your pocket has.
Trusted by avid riders and professionals alike
Overall, this app is pretty damn cool. Mostly because it’s actually useful.
For 3 of my bikes, the setup is now more relaxed. No longer any issues, even for rides of 6 to 8 hours. You improved the quality of my life!
Your bike is already the fitting studio.
Three questions, one recommendation, and a fit you can check any time your body or your bike changes.
Find your app Or compare all three side by side.