Bike Fit System

Stack &
Reach

AI-powered bike fit calculator. Get your ideal geometry, compare any frame, and chat with a virtual fitter.
v0.5RoadAny FrameAI-Powered
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See a full fit result before measuring yourself
Load a sample 178 cm endurance rider — stack, reach, seatpost, cockpit, AI advisor and all — so you know exactly what you're getting before you grab a tape measure.
Your measurements aren't saved
Discipline
🚴
Road
Drop bar — race, endurance, sportive
🌲
Gravel
Adventure & bikepacking — higher stack
⛰️
MTB
Trail, enduro & XC — long reach, flat bars
Unit System
Riding Position
⚡
Race / Aggressive
CritsAeroFast
🚴
Endurance / All-Day
Gran FondoBalanced
🏔️
Sportive / Relaxed
TouringComfort
Flexibility & Mobility
Flexibility / Mobility
Average
Very Stiff
Stiff
Average
Flexible
Very Flexible
Reach 0 mm · Stack ±0 mm
Pain & Discomfort History
🦵Front Knee
🦵Back of Knee
🔙Lower Back
💪Neck / Shoulders
🪑Saddle Discomfort
✋Hands / Wrists
🦴IT Band / Hip
🦶Foot / Hotspots
Required Measurements
Total Height
cm
required
Inseam
cm
required
Torso (C7→Hip)
cm
required
Arm Length
cm
required
Optional — Improves Accuracy
Sternal Notch
cm
Shoulder Width
cm
Thigh (seated)
cm
Lower Leg (seated)
cm
Still needed: height, inseam, torso, arm