Gravel tire width: what is ideal depending on the terrain?
One of the most important decisions when building or upgrading your gravel bike is choosing the right tire width. There's no one-size-fits-all solution: it depends on the type of riding you do, the terrain, your pedaling style, and your desired level of comfort.
At Dog Days, we test gravel routes every week and advise cyclists looking for everything from efficiency on fast tracks to traction on loose trails. Here's a practical guide to help you choose the right tire.
Most common options
38 mm: Speed and efficiency
- Advantages: good speed on fast tracks, low weight, good response on inclines
- Ideal for: "light" gravel, mixed routes with lots of asphalt, cyclists coming from road cycling
- Disadvantages: reduced grip on loose or very broken terrain
42 mm: total balance
- Advantages: absorption, traction and versatility without sacrificing too much efficiency
- Ideal for: varied routes, multi-day adventures, "real" gravel
- Disadvantages: slightly more weight and rolling resistance
45 mm or more: maximum comfort and control
- Advantages: Excellent grip, ideal for rough roads, descents, or loaded bikepacking
- Ideal for: technical terrain, long journeys, routes with cargo
- Disadvantages: more weight, less responsiveness, and you need a frame with plenty of tire clearance
Pressure according to width and terrain
A wider tire allows you to run with less pressure, which improves traction, comfort, and control:
- 38 mm: 2.8 - 3.5 bar (depending on weight and terrain)
- 42 mm: 2.2 - 3.0 bar
- 45 mm or more: 1.8 - 2.5 bar
In gravel riding, it is common to use tubeless tires to avoid punctures and allow for lower pressures with greater safety.
Compatibility: frame, rim and wheel arch
Before fitting wide tires, make sure to:
- Your frame has space for the selected width (see manufacturer's specifications)
- The rims have the correct internal width (at least 21 mm for a 45 mm tire)
- There is no risk of chafing in mud, narrow areas or with mudguards.
Dog Days Recommendation
If you do mixed routes with sections of asphalt and compact tracks: 38 mm .
If your gravel riding is varied, you ride on forest roads, trails and some rocks: 42 mm .
If you travel, carry cargo, or are looking for maximum safety and traction: 45 mm or more .
At Dog Days, we help you choose the best option for your bike, wheels, and usual terrain. You can write to us or stop by the store: we'll work with you to find the ideal pressure, tire type, and perfect setup so you can enjoy every ride more.
Riding comfortably and safely starts with the right tires.
