RoadFitter: Live Bike Fit

Knee plumb on your own photo: see whether your saddle needs to move forward or back. Plus live fitting with a voice coach as you pedal. No subscription, no cloud.

Your bike fit — live, voice-guided, on your own bike.

RoadFitter draws your skeleton LIVE over the camera image and coaches you through your fit with voice guidance — while you sit on your bike and pedal. No uploads, no waiting, no subscription.

HOW IT WORKS • Prop up your phone side-on, get on your bike, start pedaling • The voice guides you: calibration, measurement, results • Knee, torso, shoulder and elbow angles — measured live across ~30 pedal strokes, never a single snapshot • Clear recommendation (e.g. "raise saddle ~10 mm"), then re-test instantly: before/after to the degree

THREE MODES • Live Fit: guided fitting with a voice coach — our core feature • Manual Measurement: all angles in real time while you adjust your bike • Video Scan: record a short clip, full analysis of every pedal stroke

SADDLE FORE/AFT — YOUR DIGITAL PLUMB • On your own photo, at the forward crank position: a plumb line dropping from your knee • Slide it with the arrows from the knee joint to the front of your knee and see whether it sits over the ball of your foot • Deliberately no traffic light: there is no universally correct saddle position — you decide • Re-measure after adjusting and the change is shown in millimeters

FOR EVERY BIKE Road (aero & endurance), gravel, TT/triathlon, city, step-through, spin — and kids' bikes with a safety-first approach.

YOUR FITS ARE KEPT • Every measurement is saved per bike — with photo, angles and knee plumb • Find your way back after transport, a saddle swap or a rebuild

HONEST & PRIVATE • The knee angle is the only scientifically validated, injury-relevant value — and that's exactly what we tell you. Everything else is guidance based on comfort and riding style. • Angle targets apply regardless of gender (current evidence). • Your measurements and videos stay on your iPhone. No cloud, no account. • No black box: your angles are pure geometry — transparent math, not AI hype.

A professional bike fit costs $150–400. RoadFitter brings the key adjustments home — as often as you like, for all your bikes.

Note: RoadFitter is not a medical device and does not replace a professional bike fit or medical advice. If you're in pain, see a professional.