# How do you find the gear ratio on a motorcycle?

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## How do you find the gearing ratio on a bike?

The gear ratio, combined with the circumference of your wheel and tyre determines how far you will travel with each revolution of the cranks. This is expressed as 4.55 : 1 meaning that for every 1 turn I make of the pedals at the front, I will turn the back wheel 4.55 times.

## How do you find the gear ratio?

To calculate the gear ratio:

Divide the number of driven gear teeth by the number of drive gear teeth. In our example, it’s 28/21 or 4 : 3. This gear ratio shows that the smaller driver gear must turn 1,3 times to get the larger driven gear to make one complete turn.

## How do you calculate sprocket ratio?

Calculating the Sprocket Ratio

The sprocket ratio is simply the number of teeth on the driving sprocket (T1) divided by the number of teeth on the driven sprocket (T2). If the front sprocket on a bicycle has 20 teeth and the rear sprocket has 80, the sprocket ratio is 20/80 = 1/4 = 1:4 or simply 4.

## What do the numbers on a motorcycle sprocket mean?

Sprocket Ratios

This is determined by the the number of teeth on the front sprocket, compared to the number of teeth in the rear sprocket. … The higher the ratio number, the more acceleration and bottom-end power your motorcycle will have, but a lower top-end speed.

## What is gear ratio on a motorcycle?

Your gearing ratio is, simply put, the ratio of teeth between the front and rear sprockets. This ratio determines how engine RPM is translated into wheel speed by the bike. Changing sprocket sizes, front or rear, will change this ratio, and therefore change the way your bike puts power to the ground.

## What is gear ratio on a bike?

In simple terms, a gear ratio on a bike refers to how many times the back wheel will rotate for each full turn of the crank arms (pedals).

## How do I tell what gear ratio my Vin is?

The gear ratio is usually listed in the VIN code located on driver’s door, the glove box, or the ID plate on the dashboard. Count the times a rear wheel goes around for one driveshaft turn: if its 3 1/2 it’s a 3.50:1. Divide the number of teeth on the ring gear by the number of teeth on the pinion gear.

## How do I find out my rear end gear ratio?

Turn the wheel TWO revolutions and count the number of driveshaft turns. The number of driveshaft rotations will help you determine your rear axle ratio. For example, if it turned 3 and a half times, it’s a 3.50:1 ratio. If it turned 4 and a quarter times, it’s a 4.25:1 ratio.

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## How can I tell what gear ratio I have without pulling cover?

So an easy way to determine your actual gear ratio is to check the tag attached to the differential cover by the cover bolts. On the tag there should be some numbering such as 3.54 or 3.73, either of those numbers will give you the stock axle ratio.

## How do sprocket ratios work?

Sprocket size and final drive

Gearing up adds more speed and decreases the final drive ratio. You can gear down by using a larger rear sprocket or a smaller front sprocket. … For every 1 tooth that you change on the front sprocket is like changing 3 to 4 teeth on the rear (and that’s true for higher gearing ratios, too).

## How do you calculate jackshaft ratio?

The formula is to divide the J/S In by the Engine and divide Axle by the J/S Out and multiply the two to get the final ratio. Engine = Clutch Sprocket. J/S In = 20, 24 or 28 tooth input sprocket.

## Are 2.5 gear ratios good?

A good starting point would be around 2.5:1, so a 42 would be a good place to start.

## Is a bigger sprocket faster?

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).

## Does gearing down increase torque?

Gearing down reduces the speed at the rear wheel with a corresponding increase in torque. This does not affect the power of the engine apart from frictional losses.

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