Define target speed
Record loaded and unloaded speed requirements and the tire rolling diameter.
Engineering Guide
Electric Tricycle Gearbox Ratio Selection
Use motor speed, tire diameter, payload, gradeability and target road speed to define the required reduction.
electric tricycle gearbox ratio
A larger reduction generally trades road speed for wheel torque.
The catalogue lists ratios such as 1:8, 1:9, 1:10, 1:8.6 and combined gear-pair notations. The correct choice depends on the complete drivetrain and loaded duty, not the ratio label alone.
Wheel speed estimateMotor rpm ÷ reduction ratio
This is only a first-order relationship. Tire diameter, drivetrain losses, controller limits and the exact internal gear set affect vehicle performance.
Selection Sequence
Work from vehicle requirements back to the gearbox.
Define load and grade
State gross vehicle mass, starting duty, maximum gradient and length of climb.
Confirm motor input
Provide voltage, rated power, rated speed, shaft and controller limits.
Verify interfaces
Confirm the housing, axle width, half-shaft teeth, mounting side and shift arrangement.
Catalogue Ratios
Ratios shown across the catalogue range
| Model | Catalogue ratio | Max input torque | Half-shaft teeth | Rear axle fitment | Rated power | Rated voltage |
|---|---|---|---|---|---|---|
| Catalogue Ref. 001 Split Vehicle-Specific Gearbox | 1:8, 1:9 | 25 N·m | 16 / 18 | 800–980 mm | 120-type, 350–1000 W | 40 / 60 V, 12 / 18 tubes |
| Catalogue Ref. 002 Split Ordinary Gearbox | 1:8, 1:10 | 30 N·m | 16 / 18 | 800–1300 mm | 120T, 350–1200 W | 48 / 60 / 72 V, 12 / 18 / 24 tubes |
| Catalogue Ref. 003 All-in-One Ordinary Gearbox (New) | 1:8, 1:10 | 25 N·m | 16 / 18 | 1000–1100 mm | 120-type, 350–1000 W | 40 / 60 V, 12 / 18 tubes |
| Catalogue Ref. 004 All-in-One Padded Ordinary Gearbox (New) | 1:8, 1:10 | 30 N·m | 16 / 18 | 1000–1300 mm | 120-type, 350–1200 W | 48 / 60 / 72 V, 12 / 18 / 24 tubes |
| Catalogue Ref. 005 Split Docking Gearbox | 1:8.6 | 30 N·m | 16 / 18 | 800–1300 mm | 120-type, 350–1200 W | 40 / 60 / 72 V, 12 / 18 / 24 tubes |
| Catalogue Ref. 006 All-in-One Docking Gearbox | 1:8.6 | 30 N·m | 16 / 18 | 1000–1300 mm | 120-type, 350–1200 W | 48 / 60 / 72 V, 12 / 18 / 24 tubes |
| Catalogue Ref. 007 Split Gearbox (New) | 1:8.3/20, 1:9.3/23, 1:11/28 | 30 N·m | 16 / 18 | 1000–1200 mm | 120-type, 350–1000 W | 40 / 60 V, 18 / 24 tubes |
| Catalogue Ref. 008 Split Gearbox (Old) | 1:8.3/20, 1:9.3/23, 1:11/28 | 38 N·m | 6 / 16 / 18 | 1000–1300 mm | 120-type, 350–1200 W | 48 / 60 / 72 V, 18 / 24 tubes |
| Catalogue Ref. 009 All-in-One Docking Gearbox (New) | 1:8.3/20, 1:9.3/23, 1:11/28 | 22 N·m | 16 / 18 | 1000–1100 mm | 120-type, 350–800 W | 40 / 60 V, 18 / 24 tubes |
| Catalogue Ref. 010 All-in-One Docking Gearbox | 1:8.3/20, 1:9.3/23, 1:11/28 | 30 N·m | 16 / 18 | 1000–1200 mm | 120-type, 350–1000 W | 48 / 60 / 72 V, 18 / 24 tubes |
| Catalogue Ref. 011 All-in-One Shifter with Exposed Teeth | 1:8.3/20, 1:9.3/23, 1:11/28 | 38 N·m | 16 / 18 | 1000–1300 mm | 120-type, 350–1200 W | 40 / 60 / 72 V, 18 / 24 tubes |
| Catalogue Ref. 012 All-in-One Shifter (Old) | 1:8.3/20, 1:9.3/23, 1:11/28 | 38 N·m | 6 / 16 / 18 | 1000–1300 mm | 120-type, 350–1200 W | 48 / 60 / 72 V, 18 / 24 tubes |
| Catalogue Ref. 013 All-in-One Padded Shifter | 1:8.3/20, 1:9.3/23, 1:11/28 | 48 N·m | 6 / 16 / 18 | 1000–1500 mm | 120-type, 350–1500 W | 60 / 72 V, 24 tubes |
Combined values such as 1:8.3/20 are retained exactly as catalogue notation and require engineering confirmation.
FAQ
Ratio questions
Does a 72 V system need a specific ratio?
No. Voltage does not define the mechanical reduction. The motor speed, wheel size, load and performance target are required.
Can I choose the lowest ratio for the highest speed?
Not without checking loaded starting and climbing performance. A speed-oriented choice may overload the motor or produce poor gradeability.
What should I send for a ratio review?
Motor nameplate data, controller limits, tire diameter, gross vehicle mass, target speed, gradeability, axle details and existing gearbox information.