Bike Geometry Comparison & Fit Calculator

Choose two bikes to compare instantly. Database of 206 models built from Bikometry geometry guides. Manual entry available below for anything not listed.

Bike A

Bike B

Measurement

Bike A

Bike B

Choose two bikes (brand, then model, then size) to compare.

Find your fit from body measurements

Height (cm)

Inseam (cm)

What these numbers mean

Reach and stack (the two that matter most)

Reach is the horizontal distance from the bottom bracket to the top of the head tube; stack is the vertical distance. Together they define the cockpit far better than the old frame-size label.

Reach-to-stack ratio

Reach divided by stack gives a quick read on posture. Under 1.4 is upright/endurance, 1.4-1.5 balanced/trail, above 1.5 aggressive/race.

Head tube angle

Slacker (e.g. 64 deg) is more stable descending; steeper (e.g. 71 deg) steers quicker. A 1 deg change is noticeable.

Seat tube angle

Steeper effective seat angles push your hips over the bottom bracket, better for climbing and modern long-reach bikes.

Wheelbase and chainstay

Longer wheelbase is more stable; shorter chainstays are more playful. They trade off for handling feel.

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About Us

Bikometry is a discipline focused on the science and art of understanding the geometry and linkage of mountain bike frames and their suspension systems.

This intricate field studies the angles, distances, and details that define a bike's performance on various terrains. Every aspect, from the head tube angle to the chainstay length, influences how the bike behaves.

Linkage, which connects the rear wheel to the bike frame, combined with the suspension, ensures smooth rides by absorbing shocks from the terrain.

By understanding bikometry, whether you're a designer, professional rider, or enthusiast, you can optimize bike performance, choose the right model, or even craft a custom bike. Dive into bikometry with us and explore the nuances that make mountain biking exhilarating.

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