Input Parameters
RPM
Nm
Formulas
Gear Ratio (GR)

GR = N₂ / N₁ = 40 / 20 = 2.00

Output Speed (RPM₂)

RPM₂ = RPM₁ / GR = 1000 / 2.00 = 500 RPM

Output Torque (T₂)

T₂ = T₁ × GR = 50 × 2.00 = 100 Nm

(Considering 95% efficiency: 95 Nm)

Results
2.00
(Reduction)
Opposite
500
RPM
100.00
Nm
20
↻
40
↺
Export Results
Multi-Stage Configuration
Stage 1
RPM
Nm
Multi-Stage Results
2.00
Opposite
2.00
Opposite
500
RPM
100.00
Nm
Gear Presets
Select a preset to load common gear configurations. You can then modify the values as needed.
Driver Gear
20
20
mm
Driven Gear
40
40
mm
Preset Information
About Gear Presets

This section provides common gear configurations used in various applications. Selecting a preset will automatically configure the gear teeth counts and other parameters.

Common Applications
  • Bicycle Gears: Typical front chainrings and rear cassette combinations
  • Automotive: Common transmission gear ratios
  • Robotics: Standard servo and drive train reductions
  • Industrial: Heavy machinery and conveyor system ratios
Note: Preset values are typical examples. Actual gear configurations may vary based on specific designs.
Application Examples

A typical road bike might have a 53-tooth front chainring and an 11-tooth rear sprocket for high speed, resulting in a gear ratio of 4.82:1.

For climbing hills, a 39-tooth front chainring with a 28-tooth rear sprocket gives a ratio of 1.39:1.

First gear in a car typically has a high ratio (3.5:1 or more) to provide maximum torque for acceleration from standstill.

Fifth gear often has a ratio less than 1:1 (overdrive) to reduce engine RPM at highway speeds for better fuel efficiency.