What body height does this frame fit?

A 56 road bike — for what height? The number alone does not say: a 56 is a different frame at every brand. Stack and reach do say, and they are in every geometry chart. Enter them and you see from what height to what height the frame fits, and where a different stem still helps.

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.

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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

Only model and size from the listing? Look up stack and reach with an AI

Then paste it into ChatGPT, Claude or Gemini. The AI answers with a link to this page; the calculation happens here. Check stack and reach against the maker's page, an AI easily mixes up sizes and model years.

Show the text

Build me a link on Radhaltung that shows which body heights a bike frame fits. The page works that out from stack and reach; every input is in the address. Below I name a bike, usually from a listing.

ADDRESS
https://radhaltung.de/en/frame-size-for-height?art=<type>&stack=<mm>&reach=<mm>&koerper=<cm>
- Exactly these field names, lower case; the angle brackets only say what goes in and are not part of the link.
- Numbers with a decimal point and without a unit.
- Each field at most once. Leave out completely any field you are not sure about, together with its &. koerper only if I give my body height.
- The field names are German; keep them exactly as written here.

THE BIKE
- art: exactly one of rennrad, gravel, trekking, mtb. rennrad: road bike, drop bar, road tyres. gravel: drop bar, wide tyres. trekking: flat bar (trekking and touring bike). mtb: mountain bike, hardtail or full-suspension, 29" with wide knobby tyres and a wide riser bar. The page has no model for other bikes (time-trial bike, cargo bike …) — say so instead of guessing a type.
- stack: frame stack, 300 to 800 mm.
- reach: frame reach, 250 to 600 mm.

ABOUT ME — only if I state it myself; never estimate
- koerper: body height, 140 to 215 cm. It only sets the mark where I stand.

TRAPS WHEN COPYING
- Stack and reach from the column of exactly the size named, as frame measurements. Not the top tube length, not the head tube length, not "handlebar stack/reach" or "cockpit reach" including stem and spacers.
- Geometry changes between model years and frame versions, and women's models often have their own table. Without a model year: take the one that model name and size match, and name it with the source. Inches times 25.4 give mm.
- Bike type only from the list above.

HONESTY BEFORE COMPLETENESS
1. Values only from the maker's geometry table for exactly this model and size. If the maker no longer shows the model, a geometry collection (Geometry Geeks, 99 Spokes) will do.
2. Never invent stack or reach. If you cannot find them, say so instead of building a link.
3. If you cannot open web pages and take a figure from memory, say so next to the source. Then I will check it.
4. If the model or size is unclear, ask before building a link.
5. No fields that are not listed here.

OUTPUT — exactly like this, nothing else
<the one link>
Source: <address of the page the figures come from> (opened / from memory), model year <year>

The bike:

Example: a size 56 frame, Road bike, with 565 mm stack and 395 mm reach. For your frame, enter its numbers above.

This frame fits people from about 171 to 187 cm. Without changing anything, 177 to 181 cm. With a very long stem it just about fits from 187 to 191 cm as well.

At 180 cm: fits

Height and length fit without changing anything.

Body height

Calculated with average proportions: legs and arms in the usual ratio to body height. Stem and spacers as most bikes come from the factory; everyone sets the saddle to their own recommendation.

Check it in the bike fit with your measurements

Why the number on the frame is not enough

One brand measures the seat tube to the centre of the top tube, the next to the top, and at the third the size is just a name. Even within one brand, an endurance bike sits a good 30 mm higher than the race model of the same size. Every maker measures stack and reach the same way: from the centre of the bottom bracket to the top of the head tube, once vertically and once horizontally.

What the bands say

Fits: height and length are right with the stem and spacers most bikes come with.
With tweaks: with more or fewer spacers or a different stem of a common length. That is a cheap change, and the frame fits.
Just about: only with a stem shorter or longer than usual. The bike then steers noticeably differently.
Does not fit: no common stem makes up for it.

Riding style moves the bands: to ride lower you need a lower front at the same height. Longer legs or shorter arms than usual put you somewhere else — the bike fit calculates with your own measurements and shows the same band for your proportions.

Buying used

A listing usually gives only the size. Ask for brand, model and year: with those you find stack and reach at the maker or on one of the collections above. What this page does not calculate is standover — whether you can stand over the top tube. Check that when you try the bike.

No bike in mind yet?

Then the other way round: "Frame size calculator" gives you the stack and reach window for your height, and you look in the geometry charts for the frame that falls inside it.

Frame size calculator Compare two bikes

This is a guide value from a calculation, not a made-to-measure suit. If you want it exact, have someone look at you on the bike. This page stores nothing — your input lives only in the address.