A bike wheel is 26 inches in diameter. What is the bike wheel’s diameter in millimeters (1 inch = 25.4 millimeters)?
The correct answer and explanation is:
Correct Answer:
660.4 millimeters
Explanation (300 words):
To convert the diameter of a bike wheel from inches to millimeters, we use the conversion factor:
1 inch = 25.4 millimeters
The bike wheel is 26 inches in diameter. To find the diameter in millimeters, multiply 26 inches by 25.4 mm per inch: 26 inches×25.4 mm/inch=660.4 mm26 \text{ inches} \times 25.4 \text{ mm/inch} = 660.4 \text{ mm}
So, the diameter of the bike wheel is 660.4 millimeters.
Why Use This Conversion?
The metric system (millimeters, centimeters, meters) is used globally in science, engineering, and many industries. Even though countries like the United States still commonly use the imperial system (inches, feet, etc.), converting to metric helps standardize measurements and facilitates communication internationally — for example, in bicycle manufacturing.
In bike design and repair, knowing both imperial and metric measurements is essential. Many bike parts and specifications (like tire width, brake clearances, and frame geometry) are described in both systems, depending on where they are made or sold.
Understanding the Measurement
- The diameter is the straight-line distance across the wheel, passing through the center.
- A 26-inch diameter wheel is a standard size for mountain bikes.
- When converted to millimeters, 660.4 mm provides a more precise measure, especially important for components like tires or tubes that must fit exactly.
In summary, by multiplying inches by the correct conversion factor (25.4), we get the measurement in millimeters. This allows for more precise, universal communication of bike part sizes.