How to Find Bicycle Inner Tube Size

Bicycle inner tubes come in a range of sizes to fit the width of your tire. You’ll need to know the size of your wheel and tire to select the right tube. Once you have that information, finding the right size is a matter of matching up the numbers.

In this article, we’ll show you how to find bicycle inner tube size so you can get back on the road (or trail) with ease.

  • Look at the sidewall of your tire to find your bicycle inner tube size
  • The number will look something like “700 x 23c
  • If you can’t find it there, you can also check your bike’s owner’s manual
  • Another way to determine your bicycle inner tube size is to measure the diameter and width of your tire with a ruler or tape measure
  • Once you have those numbers, refer to a chart that will tell you what size inner tube you need based on those dimensions

How To Choose Inner Tubes – GCN's Guide To Road Bike Inner Tubes

Tire Tube Size Calculator

You can avoid a lot of flats by using the correct size tires and tubes on your bike. But how do you know what size you need? There are a few different ways to figure it out.

The first is to look at the sidewall of your tire. It will have a series of numbers, something like this: 700x23c. The number 700 refers to the diameter of the tire in millimeters, while 23c is the width in centimeters.

You can also find your tire size by measuring its circumference. To do that, simply wrap a tape measure around the widest part of the tire and multiply that number by 2.54 (there are 2.54 centimeters in an inch). If you don’t have a tape measure handy, there’s another way to determine your tube size.

Just enter your wheel diameter and width into our Tire Tube Size Calculator and we’ll tell you what size tube you need!

How to Find Bicycle Inner Tube Size


Is a Bike Inner Tube the Same Size As the Tire?

No, a bike inner tube is not the same size as the tire. The inner tube is smaller in diameter than the tire, and it also has a different valve stem type. The most common inner tube sizes are 16″, 18″, 20″ and 24″.

What are Bike Tube Sizes?

Bike tube sizes can be confusing, but we’re here to help! Here’s a quick rundown of the most common bike tube sizes: – 700c: The most common size for road bikes.

– 26″: The most common size for mountain bikes. – 29er: A newer size for mountain bikes, typically used for 29″ wheels. – 650b: A smaller size than 700c, typically used for gravel or cyclocross bikes.

– 27.5″: A in between size of 26 and 29er, typically used on some mountain bikes. – Tubeless: Some riders have switched to tubeless tires, which don’t use tubes at all! This is becoming more popular as technology improves.

There are many other less common sizes out there, but these are the ones you’re most likely to see. When in doubt, ask your local bike shop what size you need!


If you’re looking for the right size inner tube for your bicycle, there are a few things to keep in mind. First, you’ll need to know the diameter of your wheel and the width of your tire. You can usually find this information on the side of your tire.

Once you have those measurements, you can consult a inner tube sizing chart to find the right size. It’s also important to make sure that you get the right valve type for your inner tube. The most common types are Presta and Schrader valves.

If you’re not sure which one you need, consult your local bike shop or look at the existing valve on your old inner tube.