If you’re looking for bike wheel size charts, you’ve landed in the right place.
As a bike rider for years, I know the importance of choosing the right bike wheel size. It is totally a different measurement from the bike frame size. The wheel size of a bike is not just about aesthetics, but also about how comfortable and efficient your ride is and your ability to navigate different terrains. Generally, different riding styles, say, road bikes, mountain bikes, or hybrid bikes, come with different wheel size options. What’s more, due to the bike production in different countries and regions, there are different measurement units for wheel sizes. It can be really difficult to read the sizing markings on bikes from different manufacturers. Let alone choosing the right size as a beginner.
That’s why I’m excited to share with you my knowledge and experience in this guide to bike wheel size. To make things easier, I also include bike wheel size charts for mainstream bike types. I’m just hoping to help you find the perfect size to fit your style and needs. So, buckle up (or should I say pedal up?), and let’s get rolling into the exciting world of bike wheel sizes!
Understanding Different Bike Wheel Size Standards in the World
Despite globalization, there are still some things that are heavily influenced by regional factors. The bike wheel size standard is one of them. For example, in Japan, manufacturers use JIS, while in Europe, the ERTO standard is commonly used. Additionally, there is also an ISO standard.
These regional differences can make it challenging to find the right wheel size when purchasing bikes or replacement parts, especially for those who are not familiar with the standards used in each region.
We’ll cover the mainstream wheel size standards that are widely accepted and used globally one by one.
ISO 5775 (International Standardization Organization)
ISO 5775, originally developed by the European Tyre and Rim Technical Organization (ETRTO), is an international standard for labeling the diameter of tires and width of rims. In the past, the wheel and tire sizing systems are informal and usually overlapped with each other. The ISO clears out ambiguous systems and makes a consistent standard for international use. Now, ISO 5775 is the main international wheel size standard.
ISO sizing system is expressed in millimeters and typically displayed as “ISO XXXX” on the tire sidewall. For instance, a wheel marked as “ISO 700x23c” means the diameter of the tire is 700mm and the width of the rim is 23mm. It is the typical sizing manner. Another example is “ISO 622”, here “622” represents the diameter of the tire in millimeters.
It is worth noting that the ISO standard only specifies the nominal size of the tire and rim, and there can be slight variations in actual size between different manufacturers and models. You still need to check the manufacturer’s specifications for sure.
If you’re wondering how the rim’s width and tire’s diameter are measured, keep reading. I’ll cover it later.
The American Standard
In the United States, the American National Standards Institute (ANSI) standard has been around since the 1970s and 80s and is still commonly used. It’s similar to the ISO standard. The only difference lies in that the American standard uses inches to mark the diameter of the tire.
For example, for a “26 x 2.1” wheel in the American sizing system, “26” represents the diameter of the tire in inches (26’’), and “2.1” represents the width of the tire (2.1’’).
The French Standard
The French standard is another popular wheel sizing system used by many European bike manufacturers in the past. As the ISO standard is adopted, the French standard is gradually fading out of the market. It specifies the outer diameter and width of the tire in millimeters and is often used for road bikes. Typically, however, you will see the French sizing system use numbers and letters (A, B, and C) to indicate tire size.
For example, a road bike wheel size marking reads “700 x 25C” on the sidewall. “700” is stating the diameter of the tire and “25” is the width, both in millimeters. The letter C? Well, it’s not centimeters, but the tire width label. The French system uses letter A to D to indicate the width range, with A the narrowest and D the widest. So, C is a wide width tire. Phew.
This sizing system is not as precise as the ISO sizing system, but it does help to provide a standard for identifying different bike sizes as well as rim and tire types.
JIS (Japanese Industrial Standards)
The JIS (Japanese Industrial Standards) Committee is a national organization in Japan responsible for developing and maintaining standards for various industrial products, including bike wheels. The JIS standard for bike wheels is similar to the ISO standard, but with some slight variations specific to Japanese markets. It is known as JIS D 9112 for tires and JIS D 9421 for rims in Japan.
For example, a wheel size marked under JIS may be “27 x 1 1/4”. “27” represents the nominal diameter of the tire in inches, and “1 1/4” represents the nominal width of the tire in inches, meaning 1.25’’ wide.
Where and How to Read Tire and Wheel Size on a Bike?
If you have a bike nearby, it’s really straightforward to read the tire and wheel size markings by yourself.
Directly, look at the tire sidewall. The exact location of the markings can vary depending on the manufacturer and model, but they are typically located on the outer edge of the tire.
The rim size is usually stamped on the rim itself and can be found on the outer edge near the valve stem.
However, if you don’t have a bike at hand, you can check the specifications provided by the manufacturer, or ask a seller in a bike shop for help.
Once you find the tire and wheel size marking, you need to at first identify which standard it adopts. Then, you’ll understand the meaning of each number or letter, by referring to the explanation above.
Types of Bikes and Their Respective Standard Full-Size Bike Wheels
When it comes to wheel size, each type of bike has its own specific requirements, whether you’re looking for a bike for racing, off-road adventures, commuting, or trick riding. In this section, we’ll take a closer look at the standard wheel sizes for road, mountain, hybrid, and BMX bikes, as well as some of the other wheel size options that are available.
Road Bike Wheel Sizes
The standard wheel size on a road bike is 700C. This is the most common road bike wheel size and it can be found on virtually every adult-sized road bike in the world.700C wheels are designed for smooth, fast riding on paved surfaces, and they are typically lightweight, aerodynamic, and responsive. The tire width can be available from 23mm to 28mm, depending on the rider’s preference and the terrain they plan to ride on. Narrower tires are generally faster and more efficient on smooth roads, while wider tires offer more comfort and stability on rougher surfaces.
Except for the standard 700C wheel size, some manufacturers also offer smaller 650C wheels, with a diameter of 571mm. Bikes with these size wheels are ideal for smaller riders or have more aggressive geometry.
Road Bike Wheel Size Chart
| Wheel Size | ISO Diameter | Common Usage |
|---|---|---|
| 700C | 622mm | Standard size for road bikes |
| 650B | 584mm | Also known as 27.5”, commonly used on gravel and endurance road bikes |
| 650C | 571mm | Historically used for smaller road bikes |
Mountain Bike Wheel Sizes
There are two options for mountain bike standard wheel size: 29 inches (or 29er) and 27.5 inches (also known as 650B). The diameter of these wheels is larger than the previous standard 26 inches. And the width is also wider than typical road bike wheels, ranging from 2.1’’ (53mm) to 3’’ (76mm). These sizes are great for XC (cross country) mountain bike riders because they can easily roll over obstacles and maintain speed on rougher terrain better than smaller wheels. They also have a bigger contact patch which helps to make technical climbing and braking easier. In recent years, 29-inch wheels are becoming even more popular than 27.5-inch wheels.
26-inch wheels were once the gold standard for mountain biking in the 1990s and early 2000s. They are designed to offer the quickest acceleration. These smaller wheels are still popular with some riders, especially those who prioritize agility over speed. Riders who have smaller body frames will also find this wheel size easier to handle.
Mountain Bike Wheel Size Chart
| Wheel Size | Description | Pros | Cons |
|---|---|---|---|
| 26” | Once the most popular size, still used on some older bikes and some specific mountain bike disciplines like dirt jumping and trials | Nimble handling, strong | Less traction, less rollover ability, less stable at high speeds |
| 27.5”/650B | Introduced in the mid-2010s as a compromise between the agility of 26″ and the rollover ability of 29″ | Good balance of agility and rollover, increasingly common | Smaller aftermarket support, may be less stable at high speeds compared to 29″ |
| 27.5”+/650B+ | Uses wider rims and larger-volume tires for improved traction and comfort | Good balance of agility and traction, improved comfort | Heavier, more rolling resistance, limited tire and bike options |
| 29”/700C | Gaining popularity in recent years, especially for cross-country and trail riding | Best rollover ability, increased traction and stability, increasingly common | Less nimble, heavier, limited to larger frame sizes |
| 29”+/700C+ | Uses wider rims and larger-volume tires for improved traction and comfort | Best rollover ability and traction, improved comfort | Heaviest, limited bike and tire options, limited frame clearance |
Hybrid Bike Wheel Sizes
- Stand wheel size: 700C
- Other options: 26 inches, 27.5 inches (650B)
The standard wheel size for hybrid bikes is 700c, the same as road bikes. This wheel size allows for efficient riding on paved surfaces while still providing some cushioning for light off-road use. The tires are typically wider than those on road bikes, ranging from 28mm to 42mm. This wider tire size offers a more comfortable ride and better traction on uneven surfaces than the narrower tires of a road bike.
Like mountain bikes, some models of hybrid bikes are also available with 26-inch and 27.5-inch wheels. These smaller wheel sizes provide a more comfortable ride and better traction on rough surfaces like gravel or dirt roads. They’re also a good choice for shorter riders who may find a larger wheel size uncomfortable or difficult to maneuver.
BMX Bike Wheel Sizes
- Stand wheel size: 20-inch
- Other options: 24 inches
The standard wheel size for BMX bikes is 20 inches, which provides a low center of gravity and makes the bike easier to handle. The tires on BMX bikes are typically wider than those on other types of bikes, and they have more aggressive tread patterns to provide better traction and grip during high-speed turns and jumps.
BMX bikes are also available with 24-inch wheels. While less common than the 20-inch size, the 24-inch wheels are sometimes used by larger riders or for racing. The larger size provides a smoother ride and allows for greater speed, making it a good choice for riders who are looking to cover longer distances.
Folding Bike Wheel Sizes
- Stand wheel size: 20 inches
- Other options: 16 inches, 18 inches, 22 inches, 24 inches
One of the most common wheel sizes for folding bikes is 20 inches. This size is popular because it strikes a good balance between portability and ride comfort. 20-inch wheels are small enough to allow for easy storage and transport, yet large enough to provide a relatively smooth ride. Some folding bike manufacturers use a standard wheel size of 406mm for their 20-inch wheels.
Other wheel size options for folding bikes include 16 inches, 18 inches, 22 inches, and 24 inches.
Kids’ Bike Wheel Sizes
Kids’ bikes come in a range of wheel sizes, which are generally determined by the child’s age and height. The most common kids’ bike wheel sizes are 12″, 14″, 16″, 20″, and 24″.
- 12″ – 12’’ wheels are typically found on balance bikes or pedal bikes for kids aged 3-4 years old. These bikes are designed to help children learn how to balance before they learn how to pedal.
- 14″ – 14’’ wheels are generally for kids aged 4-5 years old. They’re often found on pedal bikes with training wheels or on balance bikes for slightly taller children.
- 16″ – 16’’ wheels are for kids aged 5-6 years old. These bikes are often the first pedal bikes for kids, and they typically come with either coaster brakes or hand brakes.
- 20″ – 20’’ wheels are for kids aged 7-9 years old. These bikes are often geared and have more features, such as suspension and multiple gears.
- 24″ – 24’’ wheels are for kids aged 9-12 years old. These bikes are often similar in design to adult bikes, with more gears and larger frame sizes.
FYI, some manufacturers also make 26″ wheels for kids’ bikes, which are designed for older children or those who are taller than average. But more commonly, 26’’ wheel bikes are for adults. You can read more about the guide to 26-inch bike for what size person.
If you’re interested in learning more about bike size for kids, we’ve also written a full tutorial about bike size charts for kids, either by height or age.
Oversized Bike Wheels (32 inches, 36 inches, and 39 inches)
There are even larger wheel options available for those who are taller than ordinary people, such as 32-inch, 36-inch, and even 39-inch wheels. These sized bikes are usually not mass-produced and are often custom-made to order. As a result, these bikes tend to be much more expensive than regular-sized bikes. The added cost of the oversized wheels, specialized components, and custom fabrication makes them a luxury item that is only accessible to a select few. However, for those who are willing to, or have to because of their height, invest in these unique bikes, the payoff can be significant in terms of performance and riding experience.
The Smallest Wheel Size Available for Adults
The smallest wheel size typically used for adult bikes is 16 inches. Bikes with 16-inch wheels are often folding bikes or mini velos, which are popular in crowded urban areas where storage space is limited. While these bikes are not as common as larger-wheeled bikes, they can still be a great option for commuting or short trips around town.
Bike Wheel Size Chart – ISO Standard
I, together with Molly in our team, worked out this bike wheel size chart with the ISO sizing system. You can easily find a proper wheel size to meet your needs.
| Wheel Size | ISO Measurement | Common Bike Types |
|---|---|---|
| 12” | 203mm | Kids’ bikes |
| 14” | 254mm | Kids’ bikes |
| 16” | 305mm | Kids’ bikes, some folding bikes |
| 18” | 400mm | Kids’s bikes, some folding bikes |
| 20” | 406mm | BMX bikes, folding bikes |
| 22” | 457mm | Kids’ bikes |
| 24” | 507mm | Kids’ bikes, some folding bikes |
| 26” | 559mm | Mountain bikes, some touring bikes |
| 650C | 571mm | Road bikes |
| 27.5”/650B | 584mm | Mountain bikes, some gravel bikes |
| 29”/700C | 622mm | Mountain bikes, gravel bikes, some touring bikes |
Bike Wheel Size Chart by Height
This chart can be a helpful tool in determining which wheel size is most suitable based on your height and the type of bike you are looking for.
| Bike Type | Rider Height | Wheel Size |
|---|---|---|
| Kids’ Bike | <3'2'' | 12” |
| 3’2” – 4’0” | 14” | |
| 4’0” – 4’5” | 16” | |
| 4’5” – 4’9” | 20” | |
| 4’9” – 5’2” | 24” | |
| Mountain Bikes | 5’2” – 5’6” | 26” |
| 5’6” – 5’10” | 27.5” (650B) | |
| 5’10” – 6’1” | 29” (700C) | |
| Road Bikes | 5’2” – 5’5” | 650B |
| 5’5” – 5’9” | 700C | |
| Hybrid Bikes | 4’9” – 5’2” | 26” |
| 5’2” – 5’6” | 27.5” (650B) | |
| 5’6” – 6’0” | 700C |
How to Choose the Right Tire for Your Bike Wheel?
Choosing the right tire is just as important as choosing the right wheel size. If you want to replace the old or worn-out tires with new ones for your bike wheels, you can take the following factors into consideration.
Tire size – Make sure to choose a tire that matches the wheel size of your bike. The tire size is typically printed on the sidewall of the tire, and it should match the ISO size of your wheel.
Tire width – The width of your tire will affect the ride quality and handling of your bike. As we’ve mentioned, narrower tires are typically faster and more aerodynamic, while wider tires provide more stability and comfort.
Tread pattern – The tread pattern of your tire affects its grip and traction on different surfaces. Smooth tires are ideal for road riding, while tires with more aggressive tread patterns are better for off-road or trail riding.
Tire pressure – Proper tire pressure is crucial for optimal performance and safety. Check the recommended tire pressure listed on the sidewall of your tire and adjust accordingly.
Tire material – Tires can be made from different materials, such as rubber or synthetic compounds, and can vary in durability and puncture resistance. Consider the terrain you will be riding on and choose a tire material that suits your needs.
How to Measure Wheel Size?
If you’re not sure what size your bike wheels are, or if you need to measure a new set of wheels, it’s easy to do with a few simple tools. Here’s a brief tutorial to measure your bike wheel size.
Step 1: Place the bike firmly. You can stand it against the wall or flip it over on the ground.
Step 2: Measure the diameter. Take a ruler or measuring tape, and go from the outer edge of the rim to the opposite outer edge, passing through the center of the wheel.
Step 3: Convert to ISO measurement. Once you have the diameter measurement, you can convert it to the ISO measurement by multiplying the diameter by 0.03937. For example, if your wheel diameter measures 622mm, the ISO measurement would be 24.5 inches (622 x 0.03937).
Bonus Tip
When choosing new wheels or tires, you should first check whether they are compatible with your bike frame and brakes. You can check the manufacturer’s specifications or consult with a bike mechanic to ensure that you choose the right size and type of wheel for your bike.
Wrap Up
In conclusion, choosing the right wheel size for your bike is crucial for optimal performance and comfort. Understanding the different bike wheel size standards and types of bikes can help you make an informed decision. The wheel size chart for different bikes can make things easier. However, it is only the starting point to finding the best fit for your specific requirements. It’s always a good idea to have a test ride in your local bike shop.
FAQ
1. What is 700C wheel size in inches?
700C wheel size is approximately 27.5 inches in diameter.
2. What is 700C wheel size in mm?
700C wheel size is approximately 622 mm in diameter.
3. What bike wheel size for my height?
The appropriate wheel size for your height depends on the type of bike you’re riding. Generally, for road bikes, a wheel size of 700C or 650B is suitable for adults. For mountain bikes, wheel sizes range from 26 inches to 29 inches, depending on your height and riding style. For kids’ bikes, the wheel size should be chosen based on their age and height. Refer to the charts earlier in this article for more information.
4. How do I know my bike wheel size?
You can find your bike wheel size by checking the size printed on the sidewall of your tire. Alternatively, you can measure the diameter of the wheel in millimeters from one side of the tire to the other.
5. What age is a 26-inch wheel bike for?
A 26-inch wheel bike is typically suitable for children aged 10 to 14 years old or for smaller adults.
6. What size is a 26-inch bike wheel?
A 26-inch bike wheel has a diameter of approximately 660 mm or 26 inches.
7. Does a bike wheel size also include the tire?
Yes, the bike wheel size includes both the diameter of the wheel rim and the tire that fits on it. When you see a size listed for a bike wheel, such as “700C” or “26 inches,” it refers to the outer diameter of the tire as well as the rim.
8. What is the most common wheel size?
The most common wheel size for adult bikes is 700C, which is typically used for road and hybrid bikes. However, mountain bikes usually come in 26-inch and 29-inch sizes, while BMX bikes usually have 20-inch wheels. Kids’ bikes come in a range of sizes from 12 inches to 24 inches.
