Whether you’ve got a flat or you’re simply preparing for the inevitable, choosing the right bike inner tube is essential for a smooth and safe ride. But with so many sizes and valve types, it can be confusing if you’re not sure what to look for.

This guide will walk you through how to check your current tyre, choose the correct valve, and help you find quality inner tube options — all available at Freewheel.co.uk.

Step 1: How to Find Your Tyre Size

The easiest way to determine the correct size inner tube is to check the sidewall of your bicycle tyre. You’ll see a number combination such as 700x25c, 26x1.95, 27.5x2.1, or 29x2.3. These numbers tell you two things: the first is the diameter of your wheel, the second is the width of your tyre.

For example, if your tyre says 26x1.95, you’ll need an inner tube made for 26-inch wheels and tyre widths somewhere between 1.75 and 2.1 inches. Inner tubes usually cover a range of widths, so you don’t need to match the exact number perfectly — just make sure you stay within the recommended range.

Step 2: Valve Types — Presta or Schrader?

Next, take a look at your current inner tube valve:

• Schrader valves are wider and similar to car tyre valves. These are commonly found on mountain bikes and hybrid bikes.
• Presta valves are slimmer, taller, and feature a small locking nut at the top. They’re most often used on road bikes and performance wheels.

Your rim will only accept one valve type, so it’s important to check before buying a replacement tube.

Choosing a Bike Inner Tube — Product Examples

Nutrak inner tubes are budget-friendly and reliable options for everyday riding:

• Nutrak Inner Tube 700C (Presta or Schrader Valve) — Compatible with most standard road tyres, with size options including 700x18–25c, 700x25–32c, and 700x35–45c. Available with either Presta or Schrader valves to suit your bike.
• Nutrak Inner Tube 26" — Ideal for leisure and mountain bikes, this tube fits 26-inch wheels with a wide range of tyre widths, including 1.75–2.1", 1.5–2", 2.1–2.4", and 4.0–4.3". Both valve types are available.

Final Thoughts

To recap, finding the correct bike inner tube comes down to two simple things: your tyre size (printed on the sidewall) and your valve type (Presta or Schrader). Once you’ve got that information, choosing the right tube is straightforward. Nutrak inner tubes offer dependable performance at a great price, making them a solid choice for everyday riding and general maintenance.

Still unsure? Visit Freewheel’s inner tube collection to explore options for every bike, riding style, and budget.