Bike Fit Calculator: Solve Knee & Back Pain Instantly

Most saddle height calculators give you one number and call it a day. This one takes four inputs — inseam, crank length, riding style, and flexibility level — and returns a full mini fit report: optimized saddle height, recommended setback, and a cockpit warning if your position is putting your hips at risk.

Pedalynx — Dynamic Fit Engine
Pedalynx

Dynamic
Fit Engine

4-input biomechanical saddle calculator — height, setback & cockpit warning.
Takes 60 seconds. Saves months of discomfort.

Input 01
Inseam length
Measure barefoot in cm: stand against a wall, press a book to your groin, measure from the floor to the book spine.
cm
⚠ Please enter a valid inseam measurement (60–110 cm).
Input 02
Crank length
Check the inside face of your crank arm — the length is stamped directly on it.
170 mm
172.5 mm
175 mm
⚠ Please select your crank length.
Input 03
Riding style
Be honest — this directly shapes your power vs comfort tradeoff.
Aggressive racer
Club rider
Endurance / touring
⚠ Please select your riding style.
Input 04
Flexibility level
Standing upright, bend forward with straight legs — how far can you reach?
Can touch toes
Can reach knees
Stiff
⚠ Please select your flexibility level.
Your Pedalynx fit report
Saddle height — BB to top
cm
Saddle setback
cm

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