Tri Bike Fit Calculator

Estimate triathlon aero position geometry from body measurements including saddle height, aerobar reach, frame size, and crank length.

Height (cm)

Inseam (cm)

Torso length (cm)

Arm length (cm)

Tab to move between fields

Saddle height (cm)

72.6

Frame size (cm)53.3

Effective top tube (cm)58.1

Saddle setback (cm)1.6

Aerobar reach (cm)55.1

Pad width (cm)20.2

Saddle-pad drop (cm)-5

Aerobar stack (cm)67.6

Crank length (mm)175

KOPS forward (cm)3.9

Hip angle (°)80

How to Use This Calculator

Measure and enter your Height, Inseam, Torso Length, and Arm Length in centimeters.
Review the recommended Saddle Height (BB to top) as your starting point.
Check Frame Size, Effective Top Tube, Aerobar Reach, and Aerobar Pad Width.
Use Saddle-Pad Drop and Hip Angle to assess your aero position comfort and power output.
Cross-reference these values with a professional bike fitter for final dialing.

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