THE BASKETBALL

four FIBA sizes with their circumference and mass — and why the rules set a bounce, not a pressure

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: sport · everyone · reference · gym

Figures from the current FIBA «Official Basketball Rules — Basketball Equipment», Table 1. Diameters computed from circumference as C/π. The widely quoted 749–780 mm and 567–650 g are an older edition.

THERE IS NO SUCH THING AS THE CORRECT PRESSURE

The FIBA rules contain no figure for pressure at all. What they contain is a requirement about behaviour: dropped from 1800 millimetres, the ball must rebound to between 1035 and 1085, both heights measured from its underside. The manufacturer simply prints a recommended pressure on the side — as advice, not as a rule.

This is deliberate: the same pressure gives a different bounce in a cold hall and a warm one, and balls with different casings bounce differently at identical pressure. So the check is not a gauge but a tape measure — and anyone can do it at home.

On the sheet

Figures from the current FIBA «Official Basketball Rules — Basketball Equipment», Table 1. Diameters computed from circumference as C/π. The widely quoted 749–780 mm and 567–650 g are an older edition.
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 5 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.

THE BASKETBALL

THERE IS NO SUCH THING AS THE CORRECT PRESSURE

On the sheet

Printing

More like this

FOOTBALL: THE BALL

BALLS BY THE RULES