How To Measure The Size Of A Bicycle Tire

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How to Measure the Size of a Bicycle Tire


Knowing how to measure the size of your bicycle tire is essential for various reasons. Whether you need to replace a worn-out tire or want to upgrade to a different size, having accurate measurements is crucial. In this article, we will guide you through the process of measuring your bicycle tire size correctly.

Gather the Necessary Tools

Before you start measuring, make sure you have the following tools ready:

  • Tape measure or ruler
  • Pen and paper

Step 1: Determine the Diameter

The first step is to measure the diameter of your bicycle tire. To do this, place the tape measure or ruler at the center of the tire and measure the distance to the outer edge. Make sure to measure in millimeters for accuracy.

Step 2: Measure the Width

Next, measure the width of the tire. Place the tape measure or ruler across the widest part of the tire, usually at the center. Again, measure in millimeters.

Step 3: Calculate the Tire Size

Now that you have the diameter and width measurements, you can calculate the tire size. The tire size is typically represented as a combination of the diameter and width measurements. For example, a common tire size is 700x25c, where 700 represents the diameter in millimeters and 25 represents the width in millimeters.

Step 4: Check the Sidewall

Another way to determine the tire size is by checking the sidewall of your current tire. Look for a series of numbers and letters, such as 26×2.1 or 27.5×1.95. The first number indicates the diameter, while the second number represents the width. Make a note of these measurements for future reference.

Step 5: Consider the Type of Tire

It’s important to note that different types of bicycles require different tire sizes. For example, road bikes typically have thinner tires compared to mountain bikes. Make sure to consider the type of bicycle you have when choosing a new tire.


Measuring the size of your bicycle tire is a straightforward process that can be done with a tape measure or ruler. By accurately determining the diameter and width, you can easily find the right replacement tire or upgrade to a different size. Remember to consider the type of bicycle you have to ensure compatibility. Now that you know how to measure your bicycle tire size, you can confidently make informed decisions when it comes to your bike’s tires.