BICYCLE CLASSES

frame, wheel by ISO 5775 and handlebar — three signs of a class, and what the frame is rated for

Built as a memo rather than a table: the thing worth hanging it up for reads across the room, with the full reference in smaller type below it.

Three sizes in one archive — from a sheet on the fridge to a poster on the wall.

Formats: A4 · A3 · A2
What you get: Print-ready PDFs, one per size, with every letterform converted to outlines — nothing to install, nothing to shift.
Subject: vehicles · everyone · reference · study

Bead seat diameters are ISO 5775; usage conditions are ASTM F2043; the saddle height boundary is EN ISO 4210-2 and ISO 8098. All seven wheels are drawn at one scale from rim and tyre width. The frames are schematic — proportions typical of the class, not any model’s specification.

THE INCHES ON A WHEEL MEASURE NOTHING

A wheel sold as «28 inch» in its Dutch form has a bead seat diameter of 635 mm — which makes it larger than a «29 inch», at 622. That same 622 circle is called 700C, 28 and 29 by turns, depending on whether the bicycle is a road bike or a mountain bike.

Twenty-six is worse: at least three different rims answer to it — 559, 590 and 571 — and their tyres do not swap. This is exactly why ISO 5775 exists: the sidewall reads «37-622», where 37 is the width and 622 the bead seat diameter. Buy a tyre by that pair, never by the inches.

On the sheet

Bead seat diameters are ISO 5775; usage conditions are ASTM F2043; the saddle height boundary is EN ISO 4210-2 and ISO 8098. All seven wheels are drawn at one scale from rim and tyre width. The frames are schematic — proportions typical of the class, not any model’s specification.
Colour carries meaning, but meaning never rests on colour alone — the sheet reads in black and white.
Nothing about how it was made: the sheet carries only what the reader needs.

Printing

Three sizes in the archive: A4 — 210×297 mm, A3 — 297×420 mm, A2 — 420×594 mm.
All text is converted to outlines. No fonts to install, and nothing shifts on another machine.
White background and sparing fills — it prints on a home printer without draining the cartridge.
Margins of at least 10 mm: a home printer cannot print to the edge.
No stroke thinner than 0.3 mm, so nothing disappears in print.

Why the numbers can be trusted. Every countable number here is computed from data rather than typed in, and the sheet must pass 6 independent checks before it is allowed to build — how many items there are, the order they come in, and the claim in the highlighted box itself. If one fails, there is no file.

BICYCLE CLASSES

THE INCHES ON A WHEEL MEASURE NOTHING

On the sheet

Printing

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