# How to calculate a transmission ratio?

**Sommaire de notre article**

- How to calculate a transmission ratio?
- How to calculate the gear ratio?
- How to choose a sprocket?
- How to choose your brushless motor combo?
- How to calculate the ratio of an electric transmission?
- How to calculate the gear ratio of a car?
- How to calculate the ratio of a car?
- How to calculate the transmission of a driving wheel?

### How to calculate a transmission ratio?

**the gear ratio is obtained by dividing the number of teeth of the crown by the number of teeth of the pinion.**

- At most the
**ratio**is greater, the more torque and acceleration you have. - At most the
**ratio**is small, the more speed you have.

### How to calculate the gear ratio?

For **calculate gear ratio**, just make the ratio between the two gears engaged in a gear. Here, the diagram indicates that the first gear is engaged with a 16 pinion for the primary shaft and a 38 pinion on the secondary.

### How to choose a sprocket?

For example: If originally you have the following ratio 15/52 (**pinion** of 15 teeth and crown of 52 teeth) and you wish to gain in acceleration, it is necessary **Choose** a chain kit that is either 14/52 or 15/55. You should know that one tooth less on the **pinion** equals 3 more teeth on the crown.

### How to choose your brushless motor combo?

**How to choose your combo** motor **brushless** ?

- no brush friction therefore less wear, longer motor life, lower power consumption and better efficiency.
- no break-in required so they are ready to use right out of the box.

### How to calculate the ratio of an electric transmission?

On an electric model, one tooth on the motor pinion is equivalent to approximately 3 teeth on the central crown. The letter R defines the ratio. It is found in principle on the manual that is delivered with his car. The ratio makes it possible to precisely calculate the final ratio of the transmission.

### How to calculate the gear ratio of a car?

And in the case of a car without a gearbox, as most RC cars on the market are, the transmission ratio determined by the number of teeth of the bevel gear(s), and by that of the bell and the central crown or the pinion and the central crown, will again prove decisive.

### How to calculate the ratio of a car?

The second reason is that an ill-defined ratio can lead to engine overheating, make the car uncomfortable, and not efficient. The ratio is therefore the formula Crown divided by Pinion ( 76/19 ) = 4 (the ratio is 4) BUT the car has an internal ratio (again a ratio between differential crown and pinion).

### How to calculate the transmission of a driving wheel?

To return to our example, we divide the 30 teeth of the driven wheel by the 20 teeth of the driving wheel and we obtain: 30/20 = 1.5 which can also be written as 3/2 or 1.5:1. This gear ratio of 1.5 means that the drive wheel must make one and a half turns to make the driven wheel make a single turn.