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A gear reducer (or gearbox) lowers the speed and increases the torque from a motor to another part. Benefits: - More torque (force) - Speed control - Efficiency - Compact size - Parallel Axes: Common, efficient. - Skew Axes: For non-parallel shafts. - Orthogonal Axes: Right-angle setups. - Coaxial Axes: Input/output shafts are aligned. - Spur Gear: Simple, efficient. - Worm Gear: High reduction, precise control. - Planetary Gear: Compact, versatile. - Bevel Gear: Changes shaft direction. - Helic

The final drive ratio is typically the gear ratio for the differential, or the final location where the gearing is altered before being sent to the wheels. Changing the final drive ratio heavily impacts the way the car behaves. If you increase the final drive ratio, each gear will have greater wheel torque, while sacrificing top speed. If you decrease the final drive ratio, each gear will have a higher top speed, however deliver less torque. Raising the final drive ratio also means you'll be at