Compare two bikes: how do you sit on each?

Two frames cannot be compared on stack and reach alone — between the top of the head tube and your hand there are still spacers and a stem. This page works both bikes out all the way to the grip, with your body on them, and then says in millimetres what changes.

How you sit — drop, length and back angle, worked out for each bike separately.
What changes — as one drawing over the other, and as a number beside it.
What you would have to change — which stem, how many spacers, and what is still missing afterwards.

Bike A — yours

Frame size

Stack (mm)

Reach (mm)

Stem (mm)

Angle (°)

Spacers (rings)

Crank (mm)

Type

Bike B — the other one

Frame size

Stack (mm)

Reach (mm)

Stem (mm)

Angle (°)

Spacers (rings)

Crank (mm)

Type

Stem and spacers are not in the geometry table — they are on your bike. The stem length is usually stamped on its side, the spacers are the rings underneath it, 5 mm each. Leave a field empty and the page works with 95 mm, −6° and two spacers.

Where do I find stack and reach?

In your bike's geometry table: open your model on the manufacturer's site and go to the “Geometry” tab. Stack and reach are given in millimetres, one column per frame size. You cannot measure them off the bike itself — they are derived figures, not tube lengths.

Bianchi BMC Bulls Cannondale Canyon Cube Focus Ghost Giant KTM Merida Rose Scott Simplon Specialized Stevens Trek

An older model year the manufacturer no longer lists? These collections often carry old models too. They are other people's sites — this page fetches nothing from them, it only points the way: Geometry Geeks 99 Spokes

Your body

Inseam (cm)

Height (cm)

Saddle height as set (mm) — optional

How you want to sit

The difference

Something is still missing for that:

Your frame's measurements — pick a size or enter stack and reach
The second bike's measurements — pick a size or enter stack and reach
Your inseam

Keep this comparison

As soon as something is entered above, this is where you will find a link that opens exactly this comparison again.