Why bike fit matters, and what "right" actually means
How BFF EZ measures your fit
| Static fit | Dynamic fit | |
|---|---|---|
| What's measured | Your body at rest. | Your body in motion. |
| How | Inseam against a wall, plumb line from the knee, ratios on a clipboard. | Reading joint angles through the pedal stroke. |
| Classic example | LeMond formula: saddle height = inseam × 0.883. | A trained fitter watching you ride; motion-capture in a fit studio. |
| Cons | Doesn't see how you move. | Historically required a fitter, costly hardware, and a per-session fee. |
| Where BFF EZ sits | — | Dynamic fit, using only your phone. |
What BFF EZ does: you record a 4.5-second side-view video of yourself pedaling. The app reads the angles of your knees, hips, ankles, and shoulders at the relevant moments, then gives you a specific millimeter adjustment for saddle height and saddle fore/aft if you're outside your window, or a confirmation if you're inside. For upper-body position it shows a classification (Upright, Relaxed, or Aggressive), because the right position is a goal-dependent choice.