Bicycle Tyres 700 x 38c: Choosing the Right Size and Type
A practical guide to bicycle tyres 700 x 38c, covering sizing, compatibility, inflation, tread options, tubeless readiness, and maintenance for road, gravel, and commuter bikes.
bicycle tyres 700 x 38c is a tyre size for 700c wheels indicating a 38 millimetre width. It is a common tyre dimension used on road, gravel, and commuter bikes.
Understanding the 700 x 38c size and its implications for your bike
According to BicycleCost, the 700 x 38c size is a versatile choice for many road, gravel, and commuting bikes. The 700c wheel reference comes from the historical ISO wheel diameter, while the 38c denotes the tyre width in millimetres. In practice, 700 x 38c tyres strike a balance between low rolling resistance and comfort on imperfect pavement. They fit a wide range of rims and frame clearances, especially on cyclocross and endurance road bikes that prioritize stability over razor-thin lines. When you see 700 x 38c printed on a tyre, you are looking at a modern, common configuration in the 28 to 40 millimetre family and capable of absorbing small surface irregularities without making the ride harsh. For most riders, this width offers a compromise between speed on smooth roads and grip on rougher surfaces, which explains why many manufacturers bundle 38c as a default upgrade option for mixed-terrain bikes. Always verify that your rims and fork have enough clearance before mounting wider tyres.
Why 38c matters: performance and comfort in one package
The 38 millimetre width provides additional air volume compared to slimmer road tyres, which helps damp vibrations and improves traction on rough surfaces. Wider tyres can run at lower pressures while maintaining pinch-flat resistance, which translates to a smoother ride on chipped asphalt, gravel paths, or wet roads. As a general rule, the 38c width is compatible with a broad range of rim widths and frame geometries, making it a practical choice for cyclists who mix commuting with light off-road riding. This versatility is why many riders choose 700 x 38c as a single upgrade that covers most of their daily routes. However, always confirm frame clearance and rim compatibility before purchasing to avoid rubbing or clearance problems on corners or when the suspension compresses on rough terrain.
People Also Ask
What does 700 x 38c mean and is it suitable for my bike?
700 x 38c is a tyre size for 700c wheels indicating a 38 mm width. It suits road, gravel, and commuter bikes that have adequate frame clearance and compatible rims.
It means your wheel is a 700c size with a 38 millimetre tyre. It works well on many road and mixed-surface bikes if there’s enough space in the frame.
Can I run 700 x 38c tyres on a bike that previously used narrower tyres?
Yes, but you must verify frame clearance and rim width. Wider tyres can rub on tight forks or chainstays if space is limited.
Yes, but check clearance and rim width first to avoid rubbing.
What is the difference between tubed and tubeless 700 x 38c tyres?
Tubed tyres use inner tubes, while tubeless tyres seal directly against the rim with sealant. Tubeless can run lower pressures and reduce flats, but require compatible rims and valves.
Tubeless tyres seal on the rim with sealant and can run lower pressures; tubed tyres rely on inner tubes.
Will wider tyres always improve comfort?
Wider tyres can improve comfort by allowing lower pressures and better shock absorption, but ride feel also depends on tread design, rim width, and bike geometry.
Wider tyres often feel smoother, but ride comfort also depends on other factors.
How do I know which tread pattern to choose for 700 x 38c?
Slick or semi-slick patterns are best for pavement; patterned tread aids grip on damp or loose surfaces. For mainly road riding, a semi-slick is usually enough.
Choose slick for pavement, or a semi-slick if you ride mixed surfaces.
What basic tools do I need to install 700 x 38c tyres?
You typically need tire levers, a pump, and optionally a tubeless repair kit if you’re using tubeless tyres. Check the rim tape and valve compatibility before installation.
Tire levers and a pump will usually do, plus a tubeless kit if you go tubeless.
Quick Summary
- Check clearance before upgrading to 38mm tyres on narrow frames
- 38c width balances comfort and performance on mixed surfaces
- Ensure rim compatibility with 700c wheels before mounting
- Choose tread pattern based on road or light off-road use
- Consider tubeless readiness for lower pressure and fewer flats