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Buying a bike
Buying a bike: frame size from height and inseam per bike type, computed and shown as a table rather than a brand chart, plus the ISO 4210 use-condition…
This launch guide maps the topic, the source base and the practical questions. Check the linked official authority before acting on a rule, deadline, price or safety requirement.
What this guide covers
Frame size from height and inseam per bike type, computed and shown as a table rather than a brand chart, plus the ISO 4210 use-condition categories that say where a bike may legally be ridden — the reason a city bike must not be taken off a kerb.
Item pages cover gear range in development metres, hub versus derailleur, rim versus disc, tyre width and pressure by rider weight, frame materials, kids' bike weight relative to the child, saddle height from inseam, and a second-hand inspection page with the frame crack points. ~16 pages.
How to use it
Use Buying a bike to understand the inputs, units and assumptions before relying on an output. A useful result should be reproducible from the named source rather than presented as an unexplained score.
The page keeps the main question, its evidence base and its limits together in one canonical place. That makes it useful as a quick orientation and avoids splitting a broad subject into shallow pages before each narrower answer has enough verified material of its own.
Search vocabulary in four languages
Terminology changes across borders. These are example phrases people use for the same subject in Estonian, Finnish, Russian and English; they are included as a practical vocabulary aid, not as hidden keywords.
| Language | Example phrase |
|---|---|
| Estonian | jalgratta raami suurus pikkuse järgi |
| Finnish | polkupyörän rungon koko pituuden mukaan |
| Russian | размер рамы велосипеда по росту |
| English | what size bike frame for my height |
Evidence and provenance
The evidence map below records the primary, official or openly licensed material chosen for this guide. It is deliberately visible so a reader can tell the difference between a rule published by an authority, a measured dataset and an editorial explanation.
Source: ISO 4210 category definitions (ISO catalogue abstract, free), published tyre-pressure and rolling-resistance research (cited), national stolen-bike registers (official links); sizing and gearing computed. · checked 2026-09-09
Source names are preserved even where an authority changes its web address. No figure is added to this launch page unless it is already present in the cited source description or can be computed from a named dataset.
Scope and boundaries
/ergo fits the bike you already own; this chooses one.
Connected TempoLife guides
The following paths are the intentional hand-offs named in the brief. They keep adjacent subjects separate while making the next useful reference easy to find.
Why it belongs on TempoLife
/ergo, /cycling-time-speed-distance-planner, /routes.
Frequently asked questions
What does this guide cover?
Frame size from height and inseam per bike type, computed and shown as a table rather than a brand chart, plus the ISO 4210 use-condition categories that say where a bike may legally be ridden — the reason a city bike must not be taken off a kerb. Item pages cover gear range in development metres, hub versus derailleur, rim versus disc, tyre width and pressure by rider weight, frame materials, kids' bike weight relative to the child, saddle height from inseam, and a second-hand inspection page with the frame…
What evidence does it use?
ISO 4210 category definitions (ISO catalogue abstract, free), published tyre-pressure and rolling-resistance research (cited), national stolen-bike registers (official links); sizing and gearing computed.
Where does this guide stop?
/ergo fits the bike you already own; this chooses one.
Turn the reference into a routine
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