物理
已验证计算器，公式透明
Bicycle Gear Ratio Calculator.
Calculates the gear ratio and gear inches for a bicycle drivetrain based on chainring and cassette sprocket sizes.
您的输入
工作原理
- 1
Enter the number of teeth on your front chainring.
- 2
Enter the number of teeth on your rear cassette sprocket.
- 3
Enter your wheel diameter in inches.
- 4
The calculator divides chainring teeth by cassette teeth to get the gear ratio, then multiplies by wheel diameter for gear inches.
chainring_teeth / cassette_teeth常见问题
What does a higher gear ratio mean?
A higher gear ratio means more speed per pedal revolution but requires more effort. It's used for flat or downhill riding.
What is gear inches?
Gear inches is the effective diameter of the wheel in inches when accounting for the gear ratio. It helps compare gearing across different wheel sizes.
How do I choose the right gear ratio?
Choose a lower ratio for climbing and a higher ratio for speed. Consider your fitness level and terrain.
工作原理
Calculates the gear ratio and gear inches for a bicycle drivetrain based on chainring and cassette sprocket sizes.
- Enter the number of teeth on your front chainring.
- Enter the number of teeth on your rear cassette sprocket.
- Enter your wheel diameter in inches.
- The calculator divides chainring teeth by cassette teeth to get the gear ratio, then multiplies by wheel diameter for gear inches.
公式
此计算器背后的数学公式，供您核对结果。
Gear Ratio
This is the number of times the rear wheel turns for each full pedal crank revolution.
Gear Inches
This converts the gear ratio into an equivalent wheel diameter, making it easier to compare different bikes.
实际应用场景
此计算在日常生活中的应用。
Bike Setup
Determine the best gear combination for your riding style and terrain.
Example: Choose a 34/28 for climbing steep hills.
Comparing Bikes
Compare the gearing of different bikes regardless of wheel size.
Example: A 50/16 on 27.5" wheels vs a 48/15 on 29" wheels.
Training
Plan gear ratios for interval training or endurance rides.
Example: Use a higher ratio for sprint intervals.
提示与常见错误
Tips
- For climbing, aim for a gear ratio below 1.5.
- For flat terrain, a ratio between 2.5 and 3.5 is common.
- Larger wheels require a slightly higher gear ratio to achieve the same gear inches.
- Test different ratios to find what feels comfortable.
Common Mistakes to Avoid
- Forgetting to include wheel diameter when comparing bikes.
- Using the wrong teeth count (e.g., counting the chainring bolts).
- Assuming a higher gear ratio is always better.
假设与限制
- Use the stated inputs and units.
- Results are estimates for planning and education.
- Check measurements and source data before making an important decision.