700x38c Inner Tube Conversion: A Comprehensive Guide

You must understand the 700x38c inner tube conversion possibility and proceedings for proper conversion and safety. 

You can convert the tire of your bike to the 700X38C inner tube with similar specs but it is quite a challenging job. You have to select the similar tube size, remove the old and safely install the new one. 

As you continue reading this article you will learn what exactly a 700x38c inner tube represents. We will also discuss the possibility of conversion, highlighting the factors to consider during the conversion process. So, stay tuned!

700x38c Inner Tube Conversion: Is It Possible?

700x38c Inner Tube Conversion Is It Possible

Yes, it is possible to convert a bicycle with a 700x38C tire to use an inner tube of the same size. When selecting an inner tube, it is crucial to match the tire diameter properly.

It will ensure proper fit and optimal performance. Therefore, you’ll need to find an inner tube labeled for 700mm diameter.

To understand the conversion process, let’s break down the dimensions:

  • 700x38C refers to the tire size, and it provides two important pieces of information:
  • The “700” dimension corresponds to the diameter of the tire in millimeters. In this case, it is approximately 700 millimeters.
  • The “38C” dimension represents the tire width in millimeters, with the “C” indicating the tire’s design or construction type.

In terms of width, inner tubes are often flexible and can accommodate a range of tire widths. Of course, a 38mm tire width is on the larger side. It is still within the range that many 700mm inner tubes can handle. 

To convert your bicycle to a 700x38C inner tube, follow these steps:

Procure a 700mm diameter inner tube

Look for an inner tube labeled for 700mm tire diameter. It’s best to check with your local bike shop or online retailers that offer a variety of inner tubes.

Select an appropriate width range 

When purchasing the inner tube, check the manufacturer’s specifications to ensure that it can accommodate a tire width of 38mm or slightly larger. If the manufacturer provides a range, make sure your desired width falls within it.

Remove the old inner tube

Does your bicycle already have an inner tube installed? So, you’ll need to deflate the tire to carefully remove the old inner tube. It typically involves removing the tire from the rim, prying off one side of the tire bead, and extracting the old tube.

Install the new inner tube

At first, partially inflate the new inner tube to give it shape and make it easier to handle. Insert the valve stem through the valve hole in the rim. Then, you should position the rest of the inner tube inside the tire. 

Moreover, you should carefully reseat the tire onto the rim. You must ensure that the tube is not pinched or trapped between the tire and rim.

Inflate and test

Once the new inner tube is in place, inflate it gradually. During this time, periodically check to ensure it seats properly and doesn’t bulge or twist. Also, inflate the tire to the recommended pressure mentioned on the tire sidewall, usually 35PSI. 

Perform a final check

After inflating the tire, inspect the entire circumference. It will help you confirm that the inner tube is not visible between the tire and rim. Additionally, verify that the tire bead is evenly seated on both sides of the rim.

Factors to Consider When Converting a 700x38c Inner Tube

Factors to Consider When Converting a 700x38c Inner Tube

When you convert the 700X38C inner tube, you can’t do it blindly. So, you should consider the tire size, valve type and inner tube quality carefully. 

Tire Size

When converting your 700x38c inner tube to a different size, it is crucial to consider the compatibility with the new tire size. The width and diameter of the tire play a significant role in determining the appropriate inner tube. 

If you are changing to a smaller tire size, ensure that the inner tube’s width is compatible with the narrower tire. Conversely, if you are switching to a larger tire size, make sure the inner tube can adequately expand to fit the wider tire.

Valve Type

Inner tubes come with different valve types, most commonly Presta and Schrader valves. The valve type of the new inner tube should match the valve hole size in your rims and be compatible with your pump. 

Presta valves are narrower and require a specific pump head, while Schrader valves are wider and similar to those found on car tires. 

Material and Quality

Inner tubes are made of either butyl or latex. Butyl tubes are more common and offer good durability, puncture resistance, and air retention. They are suitable for most everyday riding conditions. Conversely, latex tubes are more lightweight, supple, and offer lower rolling resistance. 

You should consider your riding style, preferences, and the specific advantages and disadvantages of each material when choosing the appropriate inner tube.

Tire Pressure

Different tires have specific recommended pressure levels for optimal performance and safety. When converting your 700x38c inner tube, ensure that the new inner tube can handle the recommended tire pressure. 

The inner tube should withstand the pressure without risking overstretching, blowouts, or reduced stability. 

Riding Conditions

Consider the type of terrain and riding conditions you typically encounter. If you frequently ride on rough or puncture-prone surfaces, consider opting for an inner tube with enhanced puncture resistance. 

Some inner tubes feature additional layers or materials for better protection against flats. Similarly, if you ride in wet conditions, you might prefer an inner tube with improved moisture resistance.

What Are the Benefits of Using a 700x38c Inner Tube in a 24 Speed Bike?

The 700x38c inner tube offers numerous benefits for a 24-speed bike. With its larger size, it provides enhanced stability and a smooth ride, absorbing shocks effectively. This inner tube is compatible with a wide range of terrains, making it versatile for various cycling experiences. By understanding speed bike gear terminology explained, cyclists can optimize their ride and efficiently utilize the 24-speed feature for a more enjoyable biking experience.


1. Can I convert a 700x38c inner tube to a smaller tire size?

Yes, it is generally possible to convert a 700x38c inner tube to a smaller tire size. However, ensure that the new tire size is compatible with the inner tube’s width and diameter.

2. What are the risks involved in converting an inner tube?

If the new tire size is different from the original size, it can affect the performance and safety of your bike. There is a higher risk of pinch flats, improper fit, and reduced stability.

3. Can I use a wider inner tube on a 700x38c tire?

It is not recommended to use a wider inner tube on a 700x38c tire. Using a wider inner tube may cause inaccurate fit, improper inflation, and can lead to increased risk of punctures or blowouts.

4. How do I determine the appropriate tire width for my bike?

You can refer to the manufacturer’s specifications to determine the appropriate tire width for your bike. You should consider bike frame clearance, riding style, and preferences. Also, choose a tire width that fits your bike properly and is suitable for the type of terrain and riding conditions you encounter.


Converting a 700x38c inner tube is possible but requires careful installation. Also, you must consider several factors. You must understand the tire size, valve type, material quality, tire pressure, and riding conditions for the conversion process. 

You may consult with a bicycle expert or bike shop for practical advice based on your specific requirements. Whether you’re looking to change tire sizes or upgrade your bike, find the intricacies of inner tube conversion.

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