What is stack and reach?

Stack is the vertical distance from the bottom bracket centre to the top of the head tube. Reach is the horizontal distance. Together they define the fundamental fit of a frame regardless of seat tube angle.

What is a good stack-to-reach ratio?

Racing bikes: 1.35-1.45. Endurance bikes: 1.45-1.55. Touring/comfort: 1.55+. Lower ratios mean more aggressive positions.

Why compare stack and reach instead of frame size?

Stack and reach are universal measurements that work across all brands and geometries. Frame size (cm or S/M/L) varies between manufacturers.

BikeCalcs

Stack and Reach Calculator — Compare Frame Geometry

Compare stack and reach between different bike sizes or models.

Bike 1

Stack

Reach

Bike 2

Stack

Reach

How We Calculate This

Stack and Reach Comparison

Enter the stack and reach values for two bikes to see the differences. The stack-to-reach ratio indicates how upright (higher ratio) or aggressive (lower ratio) the riding position will be.

Stack and reach values are found in the geometry charts of bike manufacturer websites.

Frequently Asked Questions

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Last updated: 2025-02-20

All calculations are estimates. Always verify results and consult a professional bike fitter where appropriate.