How to Read a Tachymeter The Motorsport Watch Guide

The Tachymeter Has One Job. Here's How It Does It.

The scale around the bezel of a motorsport chronograph has confused watch buyers for decades. It looks like it means something important the numbers decrease as they go around the dial, they don't correspond obviously to anything else on the watch, and the word itself tachymeter sounds technical in a way that doesn't help.

This is the plain-English guide. How a tachymeter actually works, when to use it, and why motorsport watches have carried this scale since the 1960s.

What Tachymeter Means

Tachymeter comes from the Greek tachos (speed) and metron (measure). A tachymeter scale allows you to calculate average speed over a known distance using the chronograph seconds hand as your timer. Speed calculation. Nothing more complex.

How to Use a Tachymeter: Step by Step

  1. Start the chronograph when you begin the kilometre.
  2. Stop the chronograph when you complete the kilometre.
  3. Read where the seconds hand points on the tachymeter scale.
  4. That number is your speed in kilometres per hour.

Example: You travel 1km and the chronograph stops at 30 seconds. The tachymeter scale at 30 seconds reads 120. Your average speed was 120 km/h. The maths: 3600 ÷ 30 = 120.

Why Tachymeters Live on Motorsport Watches

The connection between tachymeters and racing is direct and historical. Early motorsport timing required lap-by-lap speed calculations done by hand. The tachymeter bezel automated those calculations on the wrist of team managers, drivers, and officials. TAG Heuer, Breitling, and Omega developed their most iconic chronographs specifically for motorsport timing applications in the 1950s and 1960s.

In 2026, nobody actually uses a tachymeter to calculate lap speeds. The visual connection to motorsport heritage is the reason most buyers choose tachymeter watches.

Tomell Motorsport Watches With Tachymeter Bezels

Silver Blue Motorsport £310

Silver case. Blue racing dial. Full tachymeter bezel. The Tomell watch that most directly references the Swiss motorsport chronograph tradition.
→ Shop Silver Blue Motorsport  £310

Green Rubin Motorsport £310

Gold case. Green racing dial. Tachymeter. The bolder, more distinctive motorsport watch.
→ Shop Green Rubin Motorsport £310

PILOT APEX-22  £165

Black dial. Tachymeter bezel. The most affordable tachymeter chronograph in the range and the most versatile.
→ Shop PILOT APEX-22 — £165

Free UK delivery · Handwritten note in every order · 700+ orders · 4.9 stars · Prestige Award 2024/25
→ Shop the motorsport range at tomellwatches.co.uk

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