# How do you find the RPM of a gear ratio?

## How do you find the RPM of a gear ratio?

The general rule is – large to small gear means ‘multiply’ the velocity ratio by the rpm of the first gear. Divide 60 teeth by 30 teeth to find the velocity ratio. Multiply this number (2) by the rpm (120). This gives an answer of 240rpm.

How do you calculate RPM of a chain?

Take chain pitch and multiply x two. Multiply above number by number of teeth on sprocket of saw. Multiply that number by saw RPM. The number you get will be chain speed in inches per minute.

How is driven sprocket torque calculated?

Subtract the new drive ratio from the old sprocket setup drive ratio (in our example 2.63 less 2.76 equals -0.13). Divide this mathematical difference (in our case a negative value) by the original drive ratio value (-0.13/2.76 equals -0.047).

### How do you match sprockets?

This is determined by the the number of teeth on the front sprocket, compared to the number of teeth in the rear sprocket. For example, a motorcycle with a 17-tooth front sprocket and a 45-tooth rear sprocket would have a ratio of 2.65 (45 divided by 17 = 2.65).

Can gear ratio be less than 1?

The gear ratio (rt) is the ratio between the rotational speeds of two mating gears. The system may cause a reduction if the gear ratio is less than 1, or a multiplication if it is greater than 1. …

What is RPM ratio?

If you know the rotational speed of the driver wheel, which is usually measured in revolutions per minute (rpm), the gear ratio tells you the speed of the driven wheel. For example, consider a system with a gear ratio of 3:1, which means the driver wheel spins three times as fast as the driven wheel.

## How does sprocket size affect speed?

Substituting a larger front or smaller rear sprocket lowers the ratio (sometimes called “taller” gearing), resulting in more speed for a given engine rpm. Likewise, a smaller front or larger rear sprocket gives less speed for a given rpm (“shorter” gearing).

What sprocket is best for speed?

For more top end and faster top speed, use a large countershaft/front sprocket or smaller rear sprocket. This creates a taller gearing ratio that’s best for high speed situations without many tight turns like wide open desert racing.

How do you calculate driven sprocket speed?

The easiest way to calculate sprocket ratio is to count the number of teeth on both the driving and the driven sprockets and divide the first by the second. This ratio tells you how many times the driven sprocket turns for every revolution of the driving sprocket.

### What sprocket is best for top speed?

How does changing sprocket size affect speed?

Which gear ratio is faster?

A lower (taller) gear ratio provides a higher top speed, and a higher (shorter) gear ratio provides faster acceleration. . Besides the gears in the transmission, there is also a gear in the rear differential. This is known as the final drive, differential gear, Crown Wheel Pinion (CWP) or ring and pinion.