 January 8, 2023
 2003
 RC Crawlers
If you have ever purchased an RC rock crawler and tried to figure out what you will need. There is a lot of information about how to calculate total gear reduction RC Rock Crawler. This can be daunting for newbies deciding on their first RC vehicle.
I wrote this article so that you will be able to calculate the total gear ratio (TR). It will help you choose the right equipment for your specific needs.
What Is Gear Ratio?
The total gear ratio is the ratio of the number of teeth on the ring gear (the rear axle) to the number of teeth on the pinion (the front axle).
It is calculated by dividing the number of teeth on the ring gear by the number of teeth on the pinion. An example would be a ring gear with 12 teeth and a pinion with four teeth. The total gear ratio is 12:4 or 3:1.
How To Calculate Total Gear Ratio
An RC rock crawler’s total gear ratio (GT/TGR) is the sum of all the gear ratios in a complete set. In other words, it’s the sum of all the gears used to power a vehicle.
For example, if you have a 4WD axial drive Rock Crawler with a singlespeed transmission and five forward gears, the GT/TGR ratio would be 25:1.
If you have a 4WD axial drive Rock Crawler with a singlespeed transmission and four forward gears. The GT/TGR ratio would be 20:1.
Factors impacting gear ratio
The total gear ratio for an RC rock crawler can be affected by the following factors:
The number of gears in the motor
The more gears there are, the greater torque will be imparted to each one. This means that the total gear ratio for a motor with four gears is greater than that for a motor with just two gears.
Final drive ratio
The greater the final drive ratio, the less the difference between fullpower and lowpower outputs and vice versa. For example, if you were running a 3:2 final drive ratio on your crawler and wanted to run at full power (that is, 7.5:1), then your total gear ratio would be 3:1 (assuming a 4tooth gearbox).
If you were running a 4:1 final drive ratio on your crawler and wanted to run at full power (that is, 5:1), then your total gear ratio would be 1:3 (assuming an 8tooth gearbox).
Gearbox size/number of gears per turn
It’s important to remember that larger gearboxes generally have lower overall torque output than smaller ones because they have less capacity.
Wheel size
If you have a large wheel (like a tractor) and run it at low speeds, then there’s no need for much reduction since it can handle all its power with one set of tires. However, if you want to run offroad and climb over rocks or dig through mud, you’ll need more reduction so that your wheels don’t spin out when they hit obstacles or steep inclines.
Other factors

 The number of teeth on each gear – a larger number of teeth on one gear means a smaller number on the other, which means a lower overall ratio.

 The number of teeth in the spur gear – a larger number of teeth in the spur means a smaller overall ratio because you have more teeth to spin before they’re all engaged.

 The diameter of the spur and main shafts (the axle) – A larger diameter means fewer teeth are in contact with each other and, therefore, less friction, which improves efficiency and reduces heat buildup (and wear).

 The diameter of the main shafts (the axles) and the radius of their inner surface (the lips). A larger diameter results in less friction at this point and less heat buildup during operation, which can lead to less wear or even no wear over time!
What is torque, and how does it impact the gear reduction RC Rock Crawler?
Torque is a measurement of the rotation force of a spinning motor. It can be applied to either the drive wheels or the rear axle. The torque reading is measured in turns per inch (TPI). Also, expressed as a percentage of the maximum load rating, equal to the peak torque multiplied by one hundred (1 x 100).
For example, if an engine has a rating of 10 TPI and is used on a vehicle with a peak capacity of 8 TPI. It would have a maximum payload capacity of 18% of its rated capacity.
The gear ratio determines how much power is transferred from one gear to another. A lower gear ratio will transfer more power to the drive wheels. Still, less torque being transmitted through the transmission and rear axle, resulting in decreased acceleration performance. Conversely, a higher gear ratio will transfer less power to the drive wheels.
Similarly, more torque being transmitted through the transmission and rear axle, resulting in increased acceleration performance.
Other Factors that affect torque
The higher the torque, the more powerful the motor is. Many factors affect an RC rock crawler’s torque, including:
Power
The amount of power available from the battery or motor.
Voltage – How much power is available from the battery or motor to push through a circuit. Current – How much current flows through a circuit at any given time, which affects resistance and heat dissipation.
RPM – How quickly your motor turns, and thus its maximum speed.
Weight distribution
The Other factor that affects an RC rock crawler’s torque is the weight distribution. How much weight is on each wheel at any given time relative to the front and rear axles. Differentials can be adjusted manually to reduce traction problems or increase handling capabilities for better control over rough terrain.
Tire pressure & Traction
The fourth factor that affects an RC rock crawler’s torque is tire pressure and traction characteristics. These refer to the amount of grip a tire provides on various surfaces. Mud or snowcovered ground or over rocks and roots in certain situations.
For instance, in offroad racing events, tires must have maximum traction to keep their vehicles moving forward at high speeds. Still being able to handle uneven terrain safely without losing control over steering or braking systems.
The total gear reduction RC rock crawler is the combination of the pinion and spur gears. This ratio is what gives the vehicle its top speed. The higher the total gear ratio number, the faster your vehicle can travel per minute. This is why people often shorten their gears to increase their top speed to compete with their local racing circuits.
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