Bike Fast Fit
Bike Fast Fit EZ app icon

EZ tier

Bike Fast Fit EZ

  • A four-second video of you pedaling.
  • No markers.
  • No studio.
  • No appointment.

Free download · $4.99/yr subscription

US App Store price. Billed by Apple in your local currency. Cancel anytime in your App Store settings.

Download on the App Store ★ 4.6 · 690 App Store ratings worldwide
Latest release EZ 2.9.0 ·

EZ 2.9.0

  • The Tools menu arrives in EZ: the Saddle Angle tool, the general Angle tool, and the Stem Calculator, as standalone instruments.
  • Fixed: a 2.8.0 regression that misread knee analysis when pedaling backwards.
  • Fixed: a double tap on the record button could interrupt a recording.
  • Fixed: the library menu button could hide under the notice badge, and an onboarding wording error.

EZ 2.8.0

  • EZ's first motion smoother: it follows the pedal stroke more closely, with improved bottom-bracket detection. Measurements may read very slightly differently than before.

EZ 2.7.0

  • Full seven-language re-translation, with redrawn and re-localized onboarding and help images.
Every update, all three apps →
Bike Fast Fit EZ showing a tracked rider with a knee angle reading and a saddle height recommendation in millimetres, up or down
The big three

Saddle height, saddle fore/aft, and upper body position.

From one side-view video, Bike Fast Fit EZ analyzes your angles at the moments in the pedal stroke that matter, then recommends a millimeter change for saddle height and saddle fore/aft, and describes your riding position: Upright, Relaxed, or Aggressive.

Bike Fast Fit EZ showing a tracked rider with shoulder and torso angles, alongside saddle height, saddle fore and aft, and a Relaxed riding position result
Markerless AI

Just your phone, no markers.

Bike Fast Fit EZ reads your body from high-speed video with markerless AI tracking. We built that tracking ourselves on thousands of rider videos, designed specifically to track cyclists better than a generic pose model.

A rider pedaling on an indoor trainer with an iPhone propped in front of her, its screen showing Bike Fast Fit EZ recording with the tracked skeleton locked on and no markers on the rider
At a glance

About a minute, start to finish.

Saddle height, fore and aft, and position each get their own page, and the recommended change is shown plainly: how far and which way.

A Bike Fast Fit EZ summary report open on a phone, its dashboard page showing three tracked frames beside the saddle height, fore and aft, and riding position results
Check as often as you like

No limit on how often you check.

There is no cap on how many recordings Bike Fast Fit EZ keeps, so a fit is not a one-time event. Check again after a new saddle, new shoes, or a new bike, and see exactly what moved.

The Bike Fast Fit EZ recording library: recordings grouped by month, a demo recording alongside the rider's own, each marked with its saddle height and fore-aft result, and a Record button
Saddle Angle

Set your saddle level without guessing.

Lay the phone flat across the saddle and Bike Fast Fit EZ reads the tilt off it, in degrees, nose up or nose down.

The Saddle Angle tool in Bike Fast Fit EZ reading saddle tilt in degrees, nose up or nose down, with a diagram showing the phone laid flat across the saddle
Stem Calculator

Try a stem before you buy one.

Enter the stem on your bike and the one you are considering, and the calculator works out how far your handlebar would actually move, up and forward, in millimeters.

The Stem Calculator in Bike Fast Fit EZ comparing a current stem length against a proposed one, showing how far the handlebar would move in millimetres, up or down and forward or back

Who it is for

  • Riders fitting their own bike
  • People new to fitting
  • Riders who bought a bike online
  • Anyone re-checking after a new saddle, new shoes, or a new bike

Want front view, every side-view measurement, and a way to test a change before you make it? That is Bike Fast Fit Elite, and moving up asks whether to bring your BFF EZ fits over.

Free to learn

See Bike Fast Fit EZ in the Academy

Free lessons that walk through every part of an EZ fit, step by step. No app required to start.

Open the EZ track →