700x40c Tire Size in Inches- A Handy Guide for Measurement Conversion!

Are you in the market for a new set of tires but find yourself puzzled by the different sizing conventions? 

Tire sizes can be confusing, with a combination of numbers, letters, and even metric measurements, such as 700x40c. Maybe converting them into inches will help you. 

700x40c refers to the measurement of the tire of a bicycle in millimeters. The “700” indicates the diameter, while “40c” indicates the tire width in millimeters. 

Divide both numbers by 25.4. Using the formula, we can determine that a 700x40c tire size is approximately 27.5591 inches in diameter and 1.5748 inches in width. 

Keep scrolling to learn more about determining tire size, which will help you in purchasing the right bicycle for you.

Tire Size Calculator – mm to Inches

Here is our tire size calculator for your help. You can easily convert your tire size into inches with this. Don’t scroll down until you test it!

Tire Size Calculator

Tire Size Calculator

Tire Sizing Systems – Details

Tire Sizing Systems In-Depth Overview

It is important to understand how to determine your tire size in general. Most bicycle tires are labeled with a standardized sizing system that includes two key measurements: 

1/ Tire diameter and 

2/ the tire width. 

The Diameter

The diameter of a tire refers to the measurement of the tire’s outer circumference. It is typically denoted by a three-digit number, such as 700, followed by a letter or other characters. The diameter is usually expressed in millimeters for modern bicycle tires.

Tire Width

The tire width refers to the measurement of the tire’s cross-sectional width. It is denoted by a number, followed by a letter or characters that provide additional information about the tire construction or style. 

Benefits of 700x40c Tires

Benefits of 700x40c Tires

Choosing the 700x40c tire size offers a multitude of advantages that make it an appealing option for many cyclists. With its versatility, this tire size is compatible with various types of bikes. It includes road bikes, hybrids, and gravel bikes.

Here’s why the 700x40c tire size, specifically, can be considered a top choice for many cyclists – 

Versatility across different bike types

  • Suitable for road bikes, hybrids, and gravel bikes.
  • Allows riders to use the same tire size on multiple bikes, reducing the need for separate tires and simplifying maintenance.

Efficient on pavement, capable on rough surfaces

  • Offers a balance between performance on smooth roads and capability on rougher terrains.
  • Ideal for urban commuting and off-road adventures, providing a versatile riding experience.

Comfort, traction, and stability

  • The 40mm width provides a desirable combination of comfort, traction, and stability.
  • Enhanced grip on various terrains, including gravel paths, for confident and controlled riding.
  • Maintains a smooth and efficient ride on paved surfaces.

Lower tire pressure for improved cushioning and traction

  • The 700x40c size allows for lower tire pressure, providing added cushioning and shock absorption.
  • Improved comfort, especially on uneven surfaces or longer rides.
  • Enhanced traction, particularly in challenging conditions like wet or slippery surfaces.

Durability with balanced rolling resistance

  • Strikes a balance between durability and rolling resistance.
  • Offers a long-lasting tire that can withstand different terrains and riding conditions.
  • Ensures a smooth and efficient ride while maintaining tire longevity.

How Do I Convert 700x40C Tire Size to Inches?

To convert a 700x40C tire size to inches, use a simple tire size calculation in inches. The first number, 700, represents the approximate outer diameter in millimeters. Divide it by 25.4 to get the diameter in inches, which would be around 27.5 inches. The second number, 40, indicates the tire width, so it remains unchanged. Thus, the tire size in inches would be 27.5×40.

Choosing the Right Tire Size for Your Bicycle

Here are some tips you need to keep in mind about the tire while purchasing a bicycle:

  • Ensure the tire size is suitable for your bike and riding style.
  • Choose a tread pattern that matches the terrain you’ll be riding on.
  • Consider the durability of the tires based on your riding conditions.
  • Understand the recommended tire pressure range for optimal performance.
  • Decide whether you prefer traditional inner tubes or tubeless setups.
  • Evaluate the tire’s rolling resistance for efficient riding.
  • Look for tires with puncture-resistant features if you frequently encounter debris.
  • The size is a common specification available in many bike shops. So, the tire is very common and accessible.


1. How do I measure the tire size of tires to determine if they are 700x40c?

To measure the tire size accurately, use a measuring tape or caliper to determine the diameter of the tire in millimeters.

2. Can I install 700x40c tires on any bike frame?

Yes, in many cases, you can install 700x40c tires on bike frames. However, it’s important to consider factors such as frame clearance, fork clearance, and brake compatibility to ensure proper fit and compatibility.


Understanding tire sizes is essential for selecting the right tires for your bicycle. And the 700x40c tire size provides a versatile option suitable for a range of bikes. And now you know how you can convert its size into inches.

By mates!

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