How To Measure Handlebar Diameter?

One of the things with mountain bikes that are does it get much considering and often overlooked is the handlebars. The handlebars do have an effect on the rider’s overall comfort and biking experience. But what is the handlebar diameter of a bike and how to measure handlebar diameter?

Today the standard handlebar diameter is 31.8 mm but older mountain bikes and road bars used different clamp sizes which were 25.4 and 26.0 respectively. The easiest way to measure the handlebar diameter is by using the calipers you need to measure the stem.

In this post, we will go through how to measure handlebar diameter. Let’s get started!

Read more on common questions asked

What Is Standard Handlebar Diameter?

The standard handlebar diameter is 31.8 mm. But a couple of years ago mountain bikes and road bars used different clamp sizes which were 25.4 and 26.0 respectively. Now new bikes are fitted with the standard 31.8 mm. It is always worth double-checking the size.

What Is The Standard MTB Handlebar Width?

The standard width of handlebars for mountain bikes is typically 780mm or 800mm. Remember that shorter handlebars offer you more speed and agility, while on the other hand, wider handlebars will give you more control and better positioning for balance.

How To Measure Handlebar Diameter?

To get the diameter of the handlebar is to measure the girth of the stem. The vernier scale calipers tool is a useful tool and is the best way to measure the handlebars. If it is a case that you do not have calipers you can use a measuring tape.

Using the calipers you need to measure the stem with the digital calipers. Which if a modern bike will show 31.8 mm.

If it is a case that you do not have a caliper, you can use a measuring tape. Just wrap the measuring tape around the stem. Note the measurement in mm and then divide the measurement by pi (3.1415).

And if you have no measuring tape you can use cellophane tape. Just wrap a piece of cellophane tape around the circumference of the bar. Then mark the point where the tape makes one complete wrap. Remove the tape and measure the distance in mm from the end of the tape to the mark you made.

Note the measurement in mm and then divide the measurement by pi (3.1415).

What Is Bicycle Stem Angle?

The stem angle can range from a negative 10 degrees to positive 17 degrees. The higher the angle of the stem the biker will have a more upright body position. And if a lower angle the biker will have a lower body position and the bike will have a more aggressive feel.

Wrapping Up

Finally, in modern bikes, the standard handlebar diameter is 31.8 mm but older mountain bikes and road bars used different clamp sizes which are 25.4 and 26.0 respectively. The easiest way to measure the handlebar diameter is by using the calipers you need to measure the stem.

And that’s it for now! I’d love it if this post on how to measure handlebar diameter was helpful to you. Let me know if you have any questions and let me know if there is more to add.

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how to measure handlebar diameter