# How To Change The Gear Ratio On A Motorcycle?

## How do you work out motorcycle gear ratios?

To determine the final drive ratio, divide the rear sprocket size, say 49 teeth, by the front or countershaft sprocket size, say 13 teeth (like a new Yamaha YZ250F). In this case, the Final Drive Ratio is 3.77 – the front sprocket revolves 3.77 times to make one complete revolution of the rear sprocket.

## How do you adjust gear ratios?

The gear ratio is calculated by dividing the output speed by the input speed (i= Ws/ We) or by dividing the number of teeth of the driving gear by the number of teeth of the driven gear (i= Ze/ Zs).

## 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.

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## How does changing 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 is the primary on a motorcycle?

The primary drive consists of an engine output sprocket or pulley (attached to the crankshaft), clutch assembly, roller chain or belt, and housing that encloses the entire assembly. The function of the drivetrain is primarily two-fold: transmit power from the engine to the rear wheel and to provide gear reduction.

## What does changing sprockets on a motorcycle do?

By increasing the difference in tooth count between the front and rear sprocket (and lowering the gearing) you are increasing the amount of torque that is applied through the rear wheel. The increase in torque means the wheel spins up easier and you accelerate faster.

## 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.

## Can you change gear ratio?

Luckily, some tuners, such as Sharkwerks, can alter the transmission’s gear ratios to improve acceleration and shifting frequency. There’s also the axle ratio to consider. As with the transmission, changing the axle ratio changes vehicle performance. A higher ratio means better acceleration, but worse efficiency.

## What is the best gear ratio for speed?

In the real world, typical street machines with aspirations for good dragstrip performance generally run quickest with 4.10:1 gears. Lower gears are required if the car is very heavy, or if the engine makes its power at the upper end of the rpm scale.

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## Who makes the best motorcycle sprockets?

JT Sprockets is the world’s leading brand of sprockets for motorcycles and ATVs. Using only the finest raw materials and using cutting edge technology in their production, our range gives you the ultimate in replacement sprockets at unbeatable value.

## Does gearing change horsepower?

No, changing the gear ratio does not change the engine horsepower. Increasing the gear ratio, will allow the engine to reach higher RPM and horsepower faster. The down side to too high a ratio is maximum speed, where the engine reaches redline before acceleration is complete.

## Does gearing effect horsepower?

It doesn’t affect horsepower or tourqe at all. Gears make your rear tires turn faster or slower. It also effects your top end speed and milage.

## What sprocket is best for speed?

For more bottom end and faster acceleration, use a small countershaft/front sprocket or large rear 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 I increase the top speed of my motorcycle?

5) Gearing – A motorcycle can be made quicker or much faster by making changes in the gearing of the same. The right combination of front and rear sprocket can help you get the best combination of acceleration and top speed. Changing the number of teeth makes all the difference.

## Is more teeth on a sprocket better?

Adding teeth to the front and rear sprockets have opposite effects. Installing a larger countershaft sprocket creates higher gearing, while a larger rear sprocket lowers gearing. For taller gearing, a one- tooth -larger countershaft sprocket is often the best bet.