WHAT TIRE WIDTH TO CHOOSE FOR A ROAD BIKE?

Introduction

The choice of road bike tire width is an essential criterion influencing cyclist performance, comfort and safety. A well-chosen tire width also optimizes grip and durability. So understanding the differences between tire widths and their impact on your riding is crucial. In this guide, we detail the criteria to consider when choosing the ideal tire width for your riding needs.

Tire widths for road bikes: Performance and comfort

Common widths and their uses

Road bike tires come in several widths, the most common being 25 mm, 28 mm and 30 mm. Here are their specific features:

25 mm: A compromise between performance and comfort. They currently account for around 50% of the tires used by road cyclists.
28 mm: More comfort and grip, recommended for long rides and rough roads. This is currently the choice of the majority of pro cyclists (since 2023). Tests show a 15% reduction in vibration compared with 25 mm tires.
30 or 32 mm: Ideal for rough roads or ultra-endurance riding. Comfort is increased by 25%, although rolling resistance is slightly higher.

The impact of width on performance

A narrower tire offers less surface contact with the road, reducing rolling resistance. However, wider tires (25 mm and 28 mm) can be run at lower pressures, increasing comfort without penalizing speed. In fact, studies show that 28 mm tires running at low pressure generate only a 2% increase in rolling resistance compared with 25 mm tires.

To find out more about the impact of tire width on performance and pressure, check out this detailed analysis on brainybiker.com .

Influence of inflation pressure

The width of the tire has a direct influence on the recommended pressure. For example:

A 25 mm inflates to between 4.5 and 7 bar, offering a good compromise between performance and grip.
A 28 mm tire can be lowered to 4 bar, increasing comfort and stability on rough roads.
A 32 mm tire can be inflated to around 3.4 bar, absorbing up to 30% more vibration than a 25 mm tire.

How to choose the ideal width for your tires?

1. Identify your main practice

Road bike tires come in several widths, the most common being 25 mm, 28 mm and 30 mm. Here are their specific features:

Competition and performance: 25 mm for short distances (<50km), as it offers a compromise between speed and grip.
Endurance and long-distance: 28 mm, preferred by long-distance cyclists and pros for its comfort.
Gradient and ultra-distance road: 30 mm, for excellent shock absorption.

2. Check compatibility with your wheels and frame

Not all wheels are compatible with all tire widths. In general, a rim with an internal width of 19 mm is suitable for tires from 23 mm to 38 mm, while a rim with an internal width of 21 mm can accommodate tires up to 40 mm.

3. Taking pressure and comfort into account

A wider tire allows you to ride at a lower pressure, improving comfort and handling. As a result, cyclists feel up to 20% less fatigue over long distances with 28 mm tires than with 25 mm tires.

Cyclists on downhill road bikes at high speed

Choosing the right tire width for optimum performance

The choice of road bike tire width is strategic and depends on several criteria: performance, comfort, terrain and compatibility with your equipment. Opt for a tire width that suits your riding style, to optimize your cycling experience.

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