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When shopping for a bicycle, you may have come across the term "700c" in reference to the wheels. But what exactly does this number mean, and how does it affect your ride? Understanding wheel sizes is key to choosing the right bike, as the size can impact everything from comfort to performance. Let’s explore what 700c refers to, how it compares to other wheel sizes, and why it matters for cyclists.

The Origins of the 700C Designation

The term "700c" is rooted in a traditional European system used to describe the diameter of a bicycle wheel. In the original French system, bicycles were labeled with a number that roughly indicated the diameter of the tire. The "700" part of "700c" refers to a wheel that has a diameter of approximately 700 millimeters (or about 27.5 inches).

The "c" designation refers to the width or the type of rim that is paired with the tire. Over time, the system evolved, but the basic terminology has remained largely the same.

In this system, the letter (a, b, c, or d) historically indicated the rim width, with "c" being the most common. This was important because different rims would accommodate different tire widths, which in turn affected the overall ride quality.

However, the modern 700c wheel does not necessarily conform to a strict 700mm diameter—rather, it’s a standard used in the industry, and the actual measurement may vary slightly.

The Actual Size of a 700C Wheel

Though the term 700c suggests a wheel with a diameter of 700mm, the actual measurement is slightly different. A 700c wheel is typically 622 millimeters (or about 24.5 inches) in diameter at the rim’s bead seat, the part where the tire’s bead sits on the wheel. When a tire is mounted on the rim, the outer diameter of the wheel and tire combination is closer to the 700mm mark.

However, the term 700c can be misleading if you’re expecting an exact 700mm diameter—it’s really just a designation.

The tire width can vary depending on the type of cycling you do. For example, road bike tires usually range from 23mm to 32mm in width, while tires for gravel or cyclocross bikes might go up to 40mm or more. The wider the tire, the more comfort and traction you’ll have, but it can also affect rolling resistance and speed.

700C in Comparison to Other Wheel Sizes

The 700c size is primarily used for road bikes, hybrids, and some touring bikes, but it's far from the only option out there. There are several other common wheel sizes, each with its own benefits and drawbacks.

• 26-inch wheels: Traditionally used for mountain bikes, these wheels are smaller than 700c and provide more maneuverability and strength for off-road riding. The smaller diameter offers quicker acceleration, but it also results in a rougher ride on paved surfaces compared to the 700c.

• 650B wheels: Also known as 27.5-inch wheels, these are an intermediate size between 700c and 26-inch wheels. These are commonly seen in mountain bikes and gravel bikes. They offer a good balance between comfort and performance, providing more traction and comfort than a 700c, while being slightly more nimble than a 29-inch (700c) wheel.

• 29-inch wheels: These wheels are often found on mountain bikes and are sometimes referred to as "29ers." They have a larger diameter than 700c wheels, which helps provide more stability, smoother rides over obstacles, and better rolling over rough terrain.

Each wheel size has its own merits depending on the terrain and the kind of riding you do. For example, 700c wheels are ideal for road bikes due to their efficient rolling and smooth ride on paved surfaces. However, if you're doing mountain biking, a 29-inch or 26-inch wheel might be more suited for the terrain.

How 700C Affects Performance and Comfort

The 700c wheel size is favored for road biking because of its balance between performance, comfort, and efficiency. A larger wheel like the 700c allows for a smoother ride over bumps and rough surfaces, which makes it easier to maintain high speeds on paved roads.

Since 700c wheels are larger, they also cover more ground with each rotation, reducing the effort required to pedal over long distances.

On the flip side, the 700c wheel is less maneuverable than smaller wheels, especially when it comes to tight turns or navigating tricky terrain.

However, for long-distance road cycling, touring, or commuting, the 700c wheel provides a comfortable and efficient ride. The 700c tire is also more versatile, accommodating a wide range of tire types, including slick road tires, wider gravel tires, or even knobby tires for off-road cycling.

Tire Selection for 700C Wheels

When choosing tires for a 700c wheel, there are several factors to consider, including the width of the tire and the type of riding you’ll be doing. Road cyclists typically use narrower tires (23mm to 32mm), while gravel or cyclocross riders may opt for wider tires (35mm to 45mm or more) to provide more grip and comfort on unpaved surfaces.

Tire width plays a key role in comfort and performance. Wider tires, while slower due to increased rolling resistance, offer better shock absorption and traction, making them ideal for rougher or off-road conditions. On the other hand, narrower tires are faster on smooth roads and improve aerodynamics, making them the choice for road racers.

Conclusion

In conclusion, the "700c" designation is a key element of bike wheel sizing, and while it refers to a nominal diameter of 700 millimeters, it’s really an industry standard that corresponds to a 622mm rim diameter.

This size is commonly used in road bikes, hybrids, and touring bicycles, offering a good balance between comfort and performance on paved roads. While 700c wheels are not the only option available, they are ideal for riders seeking speed, efficiency, and comfort on smooth terrain. Understanding how the 700c wheel size works will help you make informed choices when selecting the best bike for your riding style.