How to Measure a Bike’s Wheel

Buying a bike is very much exciting, and that feeling gives more Goosebumps when we start riding on the new bike. But how it’d feel when you began to get uncomfortable and losing control over the bike? Well, one of the common reasons behind this problem is not paying attention to the correct size according to the biker’s height. Bike companies make different models with different sizes so that people can find their perfect size. And it’s really important to measure the size, especially the wheel’s size for comfortable and safe riding, although many people tend to ignore it suffer while riding. That’s why today we’re here to provide you with some tips and tricks about measuring a bike’s wheel and other requirements!

How to Measure a Bike’s Wheel

Traditional Sizing

In the past, there were many different measurement systems, such as the European metric system, British and US imperial versions, etc. At that time, the sizing of each company used to be different, and it was hard to find a replacement for the wheels. But the lack of compatibility and confusion has made the companies to use other sizing measurements for the wheels. That’s why they’re not considered as a standard measurement now.

ISO Sizing

ISO or The International Organization for Standardization has developed a standard measurement system to overcome the lacking of the traditional method. The new system uses millimeters to identify the size of the bike wheels. There’s no need to use a measuring tape for the metric system. You just have to remember that 1-inch equal to 25.4 millimeters and while calculating the width, multiply the inches with 25.4. As it’s the standard method and used world, you’ll find no trouble measuring your wheels. Also, nowadays, the size is printed to the tires’ wall, so you can easily find and check that.

"ISO sizing" How to measure a bike's wheel

Now let’s start talking about the process by which you can measure your bike’s wheels. And we’ve also added a chart for different wheel sizes for your convenience.

Step 1: Stand your bike up and keep it steady by leaning it against a wall or over a bike stand.

Step 2: Put a measuring tape and hold it against the center of the wheel and extend it toward the tire’s outer margin. As we’re measuring in the ISO method, calculate the numbers in millimeters from the center of the wheel to the inner margin of the tire and double numerical value.

Step 3: Now comes the easy part that is measuring the width. Again take the tape on the flat part across the tire’s tread from one side to the other in a straight direction, although the measurement of the width can vary depending on the purpose of use. For example, mountain bikes have wider tires as they’re use for rough, bumpy roads. On the other hand, regular bikes have comparatively narrow tires for smooth and casual riding.

Calculate the Circumference of the Wheel

Now you know the width and diameter of the wheels. But if you know the circumference, which is the length of 1 complete revolution of the wheels, it’ll help you find the right wheels while replacing the old ones. And the formula for calculating circumference is straightforward. You just have to multiply pi or 3.1415 with the diameter. Bike manufacturers use this measurement as a standard technique. But there’re other ways as well by which you can find out the circumference.

Calculate the Circumference of the Wheel

Using a String

You can use a string to calculate the wheels’ circumference, in case you don’t know the actual diameter. Take the string and wrap it over the wheel and cut it on the end of a complete circle. And the length of that string completing the whole circle of the wheel is the circumference of your bike’s wheel.

Using a String

Using Wet Paint

Spat a little amount of wet paint to only one spot to the outer portion of the tire. Move the bike and stop when the tire completes a full round stating from the spot of the paint and ending to exactly that point. Measure the length between the two dots on the ground, and you’ll get the wheels’ circumference.

How to measure a bike's wheel using wet paint

The Future of the Wheel Sizes

The way other parts of the bike have improved, wheels have almost been in a neglected position. But now the situation has changed, and they’re getting the most attention. Soon bikes are coming with superior quality and big sizes. So that the bike riding gets more spontaneous. Also, the fact of sizing is getting more standard so that people won’t have to suffer any more in case of not finding a suitable bike according to their height or not getting the perfect replacement of their old wheels.

Bike Wheel Size Chart

Tire Size

Circumference (Meters)

Circumference  (mm)

ISO

700 x 18C

2.07

2070

18-622

700 x 19C

2.08

2080

19-622

700 x 20C

2.086

2086

20-622

700 x 23C

2.096

2096

23-622

700 x 25C

2.105

2105

25-622

700C Tubular

2.13

2130

Cell

700 x 28C

2.136

2136

28-622

700 x 30C

2.146

2146

30-622

700 x 32C

2.155

2155

32-622

700 x 35C

2.168

2168

35-622

700 x 38C

2.18

2180

38-622

700 x 40C

2.2

2200

40-622

700 x 44C

2.235

2235

44-622

700 x 45C

2.242

2242

45-622

700 x 47C

2.268

2268

47-622

650 x 20C

1.938

1938

20-571

650 x 23C

1.944

1944

23-571

650 x 35A

2.09

2090

37-590

Leave a Comment