Troubleshooting & FAQs

What does BFF EZ actually measure? Three things, from one 4-second side recording: Saddle Height (a millimeter adjustment), Saddle Fore/Aft (a millimeter adjustment), and Upper body position (a classification: Upright, Relaxed, or Aggressive). Lessons 2 through 6 walk through each one.

How do I switch between metric and imperial? Set it in iOS Settings → BFF EZ. It applies to everything.

I recorded twice and got slightly different numbers. A few millimeters of variation between captures (up to about 5 mm) is normal. It reflects tiny differences in your pedaling, foot angle, how you're sitting on the saddle, and the tracking margin. Once you're within that range, you're inside your window, so go by feel rather than chasing an exact number. About a centimeter or more of swing with nothing changed points to a tracking issue, so re-record (check lighting, visibility, steady pedaling).

My measurements changed after an app update. Did I do something wrong? No. When an update ships improved tracking, BFF EZ re-runs the analysis on your existing recordings the first time you open them. The new values reflect the better algorithm, so trust them over the old ones.