Maklin

Bike Geometry Comparison

Compare up to four bikes side by side — pick from the database or enter your own, then dial in the fit.

Mode

Rider

ft in / cm
Height drives anatomically-correct body proportions. Expand to enter measured inseam / torso / arm / shoe size and fine-tune cleat, ankling, and how far back the rider sits.
Compare bikes

Bike A

Bike B

Bike C

Bike D

Frame geometry

Bike details

Bike A

Bike B

Bike C

Bike D

Photo / video fit BETA

Upload a side-on photo or video of the rider on the bike. Auto-detect finds the joints (video averages across the pedal stroke for accuracy — more reliable than a still), or drag the dots yourself. Read the real joint angles (no scale needed), then Apply to rider model so the figure on the bikes becomes this rider.

Cockpit A

—
100 mm
-6°
20 mm

Cockpit B

—
100 mm
-6°
20 mm

Cockpit C

—
100 mm
-6°
20 mm

Cockpit D

—
100 mm
-6°
20 mm

Match fit

Set the others up to reproduce ’s saddle & hand position

Solves each bike’s saddle height/setback and stem/spacers so your saddle and hands land in the same place — then flags any setup that needs an out-of-range stem or spacer, and reports how close the bar lands. Stem rounds to 10 mm, spacers to 5 mm (real parts).

BB = origin · grid = 100 mm
Show:
Rider is a proportional model from height — an approximation, not exact measurements. Knee target at the bottom of the stroke ≈ 145–150°.

Fit Check

General static-fit guidance from common bike-fitter ranges (road / gravel) — not a substitute for a professional fit. Uses the current rider model and each bike’s saddle/cockpit.

Fit suggestions

Model-predicted adjustments to bring the rider into common fit ranges, in the order to make them (saddle height → fore/aft → cockpit), each with the predicted result. Each step’s starting number assumes the steps above it are already made (so it can read differently from the Fit Check’s current snapshot). Targets are typical published fitter ranges — to be sourced/refined to your fit philosophy. Decision-support, not a substitute for a pro fit.

Fit report

Generate a branded one-page report — rider, position on the bike, measured angles, and the recommended adjustments — to hand or send to the rider (e.g. for a remote video fit). Prints or saves as PDF through your browser.

Stack & Reach map

Each shown bike plotted by frame reach (across) and stack (up). Bikes that sit close together fit alike; lower-right = longer/lower, upper-left = shorter/taller.
Your current bike (★, plotted on both maps):

Grip location map

Where each bike puts your hands relative to the saddle — reach across, drop down. Filled dot = hood, ring = drops. Clustered = same hand position; lower-right = longer & lower (more aggressive).

Size finder

Pick a model — for the current rider it sweeps every size and suggests the best fit (neutral 100 mm stem, 20 mm spacers, saddle auto-set to the rider). A starting point, then fine-tune stem/spacers.

Touch points (numbers)

Saved fits & notes

Save this whole comparison (bikes, cockpits, rider & notes) on this device and reload it later.