25mm vs 28mm Tire Width: Which Performs Better?

When it comes to road cycling performance, tire width has become one of the most discussed topics in recent years. Traditionally, 23mm and 25mm tires were the go-to for racers and enthusiasts alike, but the 28mm tire has rapidly gained popularity—even in professional racing. So, how do 25mm and 28mm tires compare, and which one is right for your setup?

1. Rolling Resistance

You might be surprised to learn that wider tires can have lower rolling resistance than narrower ones—especially at lower pressures. A 28mm tire, when inflated to the appropriate pressure, deforms less vertically and more radially, allowing for a larger contact patch and improved energy efficiency over rough surfaces. However, 25mm tires might still offer lower resistance on ultra-smooth asphalt at higher speeds.

Verdict: 28mm often wins on real-world roads.

2. Comfort and Ride Feel

The most immediate difference between the two is comfort. A 28mm tire absorbs road imperfections more effectively due to its larger air volume, allowing for lower pressures without pinch flats (especially if you're running tubeless). This translates to reduced fatigue over long distances.

Verdict: 28mm offers superior comfort and better vibration dampening.

3. Aerodynamics

This is where 25mm tires still shine—particularly when paired with narrow aero rims. A narrower tire presents less frontal area and typically matches rim width better for cleaner airflow. However, with the latest generation of wide-profile rims, 28mm tires can still maintain solid aero performance.

Verdict: 25mm has the edge on aero-specific setups, but modern wheel designs have narrowed the gap.

4. Grip and Cornering

The larger contact patch of a 28mm tire can offer more predictable grip, especially on uneven or wet surfaces. This makes a significant difference during fast descents or technical corners. Still, for dry tarmac in race conditions, both sizes perform comparably if matched with a good tire compound.

Verdict: 28mm offers better grip versatility; 25mm is sufficient for smooth, dry racing.

5. Weight and Acceleration

25mm tires are generally lighter, which can be beneficial for climbing and sharp accelerations. While the weight difference between 25mm and 28mm is often only around 40-60 grams per pair, for weight-conscious riders, it may be a deciding factor.

Verdict: 25mm is slightly lighter and may feel snappier on climbs.

Final Thoughts

Choose 25mm if you race frequently on smooth roads, prioritize aerodynamics, or are building a lightweight setup.

Choose 28mm if you value comfort, ride on rougher roads, go on long-distance rides, or want lower rolling resistance on varied terrain.

The best tire width ultimately depends on your rim compatibility, riding style, and road conditions. With modern carbon wheelsets designed to accommodate wider tires, 28mm is becoming the new standard for many cyclists—not just for comfort, but for performance too.