February 26, 2026

How to choose the right inner tube for your bike

Choosing the right inner tube for your bike can seem complicated, but with the right information, it becomes simple. A properly fitting inner tube ensures safety, comfort, and optimal performance during your rides.

In this comprehensive guide, we'll explain everything you need to know: from sizes to valves, from compatibility to materials. Whether you have a road bike, a mountain bike, or a city bike, you'll find the answers you're looking for.

1. Understanding inner tube sizes

Inner tubes are identified by two numbers that indicate the diameter and width of the tire. Here's how to read them:

ETRTO format (European standard):

Example: 28-622 (e.g. on 28 5/8 1/8 tire e.g. on 700 x 25/32 inner tube box)
First number (28) = width in mm
Second number (622) = internal diameter in mm

Inch format (traditional):

700x23c (road bike)
26x1.95 (MTB)
700x35 (city bike)
26x3/8 (classic women's bikes)
700 x 48 (Gravel)

How to find the right size:

Check the sidewall of your tire
Look for the writing with the measurements (e.g. 700x25c or 28-622)
Choose an inner tube compatible with that range

💡 Expert tip: Inner tubes cover a range of sizes (e.g. 700x35-43c), so one tube can fit multiple tire widths.

2. Types of valves: which one to choose

There are three main types of inner tube valves:

Presta (or French) valve

Thin and long (6-8mm in diameter)
Standard for road and gravel bikes
Ideal for narrow rims and high pressures
Requires specific pump or adapter

Schrader (or American) valve

Wider (8mm), similar to that of cars
Common MTB and city bike advice
Make sure your pump has a Schrader or dual-head compatible head.
Sturdy and easy to inflate

Italian Valve (or Dunlop)

Traditional, used on classic bikes and city bikes
Average diameter
More common today

How to choose: Check the hole in your wheel rim—it should match the valve diameter. If in doubt, take the old tube to the shop.

3. Inner tubes by type of bicycle

Racing bike

Common sizes: 700x18/25
Valve: Presta
Pressure: 6-8 bar
Material: lightweight or ultralight butyl for competition

MTB (Mountain Bike)

Common sizes: 20", 24", 26", 27.5", 29"
Width: 1.9-2.5"
Valve: Schrader or Presta
Pressure: 2-4 bar

Gravel

Dimensions: 700x38/45
Valve: Presta
Pressure: 3-5 bar

City bike / Trekking

Measurements: 28 5/8 3/8
Valve: Italian or Presta
Pressure: 3-5 bar

Classic women's bikes

Measurements: 26 x 3/8
Valve: Italian
Pressure: 3-5 bar

Children's bike

Sizes: 12", 16", 20", 24"
Valve: Italian (easier)

4. Materials and characteristics

Butyl (standard)

More common and convenient
Good air tightness
Strong and durable
Ideal for everyday use

Ultralight (performance)

Lighter
Better smoothness
It loses air faster
For competitions

Extra Features:

Puncture-proof: Increased thickness for extra protection
Self-sealing: With integrated preventative liquid

5. Practical advice for choosing

To do:

✅ Always carry a spare camera on long outings
✅ Check the compatibility between the tube, tire and rim
✅ Choose long valves (60-80mm) if you have tall/aerodynamic rims
✅ Replace your inner tubes regularly (every 1-2 years or after multiple punctures)
✅ Inflate to the correct pressure indicated on the tire

To avoid:

❌ Avoid using tubes that are too narrow or too wide compared to the tire
❌ Do not repair rooms with more than 2-3 patches - better to replace

Find the perfect inner tube for your bike

Choosing the right inner tube is essential for the safety and comfort of your rides. Now you have all the information you need to make the right choice based on your bike type and riding style.

Need help finding the perfect inner tube for your bike?

Visit our store in Florence at Via San Gallo 38/42r or browse our online selection of inner tubes in all sizes and types. Our team is available to advise you on the best solution.

📍 Sergio Bianchi Cycles - Florence, Via San Gallo 38/42r
📞 Tel: 055 499385