Cycling Speed Calculator
Calculate your cycling speed, time, or distance based on the other two variables.
CyclingDetermine the Gear Ratio, Gear Inches and Chain Angle of Your Bike Based on Chainring and Sprocket Sizes
Bike Gear Ratio Calculator
Calculate gear ratio, gear inches and chain angle of your bike based on the chainring and sprocket sizes.
Bicycle Gear Ratio Calculator
Enter the details of your bicycle to calculate the gear ratio or try some variations to get the perfect setup for your needs.
mm
RPM
°
34
50
11
12
13
14
15
17
19
21
23
25
27
Bicycle Gear Ratio Chart
You can hover each gear combination to see the development, speed, and chain angle.
The gear ratio chart is only visible on a larger screen. You can find all the data in the table below.
Bicycle Gear Ratio Table
| 27 | 25 | 23 | 21 | 19 | 17 | 15 | 14 | 13 | 12 | 11 | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 34 | 1.26 14.3 km/h 2.65 m | 1.36 15.5 km/h 2.86 m | 1.48 16.8 km/h 3.11 m | 1.62 18.4 km/h 3.41 m | 1.79 20.3 km/h 3.77 m | 2.00 22.7 km/h 4.21 m | 2.27 25.8 km/h 4.77 m | 2.43 27.6 km/h 5.11 m | 2.62 29.7 km/h 5.51 m | 2.83 32.2 km/h 5.96 m | 3.09 35.1 km/h 6.51 m |
| 50 | 1.85 21.1 km/h 3.90 m | 2.00 22.7 km/h 4.21 m | 2.17 24.7 km/h 4.58 m | 2.38 27.1 km/h 5.01 m | 2.63 29.9 km/h 5.54 m | 2.94 33.4 km/h 6.19 m | 3.33 37.9 km/h 7.02 m | 3.57 40.6 km/h 7.52 m | 3.85 43.7 km/h 8.10 m | 4.17 47.4 km/h 8.77 m | 4.55 51.7 km/h 9.57 m |
Scroll to the right to see more gear combinations!
Total Gear Range: 361.0%
Need to calculate the correct Chain length for this gear ratio?
Selected Cassette: 11-27
Selected Chainrings: 34/50
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About the Bike Gear Ratio Calculator
Learn more about the calculator and its creator
Jonas
I'm a software developer and bike enthusiast from Germany with over 10 years of cycling experience. I created this gear ratio calculator to help cyclists find the perfect gear ratio for their bike.
Understanding Bicycle Gear Ratios
The Gear Ratio Calculator helps cyclists understand the relationship between their bike's gearing and performance. Here's an explanation of how it works and what the results mean:
What is Gear Ratio?
Gear ratio is the relationship between the number of teeth on the front chainring and the rear sprocket. It's calculated using this simple formula:
Gear Ratio = (Front Chainring Teeth) ÷ (Rear Sprocket Teeth)
For example:
Gear Ratio = 50 ÷ 25 = 2.00
Key Concepts
-
1
Gear Ratio
The number of turns the rear wheel makes for each complete rotation of the pedals.
-
2
Gear Development
The distance traveled for one complete rotation of the pedals, typically measured in meters.
-
3
Gear Inches
An imperial measure of gearing, representing the diameter of an equivalent direct-drive wheel.
Calculation Process
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1
Calculate Gear Ratio
Divide the number of teeth on the chainring by the number of teeth on the sprocket.
-
2
Calculate Gear Development
Multiply the gear ratio by the tire circumference to get the distance traveled per pedal revolution.
-
3
Calculate Speed
Use the gear development and cadence to determine the speed at a given pedaling rate.
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4
Calculate Chain Angle
Estimate the chain angle based on the relative positions of the chainring and sprocket.
Understanding the Results
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1
Gear Ratio Table
Shows the gear ratio, speed, and development for each chainring-sprocket combination.
-
2
Gear Ratio Chart
Visualizes the gear ratios, showing the relationship between chainrings and sprockets.
-
3
Total Gear Range
The percentage difference between the lowest and highest gear ratios.
Interpreting the Results
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1
Lower Gear Ratios
Easier for climbing and acceleration, but limit top speed.
-
2
Higher Gear Ratios
Better for high speeds on flat terrain or descents, but harder to pedal.
-
3
Chain Angle
Indicates potential for increased wear or inefficiency in extreme gear combinations.
-
4
Gear Range
A wider range offers more versatility for different terrains and riding conditions.
Use this calculator to optimize your bike's gearing for your riding style and terrain. Remember that personal preference, fitness level, and specific riding conditions all play a role in determining the ideal gearing for your bicycle.
Find Your Gear Ratios and Perfect Gearing with Our Bicycle Gear Calculator
Finding the perfect gears for your bike can be tricky. This is what we designed our bike gear calculator for. By entering details about your front chainring, tire size, and current gears, our awesome bicycle gear calculator shows you all the details necessary to find the perfect combination of gears for your bike and gives you instant visual feedback on your gearing.
Gear Inch Calculator
Next to the gear ratios, our bike gear calculator also calculates the gear inches for every gear resulting from your inputs. You can see them by hovering over each cog in the chart to see details on that gear including the development, speed, and more on that cog.
Whether you're a casual rider or a competitive cyclist, understanding your bike's gearing can help you optimize your performance and enjoy a more comfortable ride. Use our calculator to find the perfect gearing setup for your cycling needs.