How do you find 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 find the gear ratio?

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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What is final drive ratio of motorcycle?

Final Drive – The ratio between the number of teeth on the front sprocket (the small one) and the rear wheel sprocket. When talking about complete motorcycle gearing (all of the above) this is referred to as the total gearing ratio.

Do smaller sprockets go faster?

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. Gearing down reduces speed and increases the final drive ratio. … For more bottom end and faster acceleration, use a small countershaft/front sprocket or large rear sprocket.

Does VIN number tell gear ratio?

Just because it has a specific engine size or transmission type does not mean that the vehicle uses one specific gear ratio. Vehicle manufacturers will usually offer at least two gear ratios for any given vehicle model. … For most vehicles, the VIN does not provide gear ratio or limited slip information.

How do I know what gear ratio My rear end is?

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.

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

With the transmission in neutral, rotate the rear driveshaft by hand. Count the number of driveshaft revolutions required for one revolution of the tire. If the driveshaft turns approximately 3-1/2 times, you have a 3.54 ratio, etc.

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What is a tall gear ratio?

The difference between tall and short gears is really just referring to the ratio. Tall gears have LOWER ratios (2.80, 3.00, 3.25, 3.40, etc.), whereas short gears have HIGHER ratios (4.71, 5.00, 5.14, 6.50, etc.).

What gear ratio means?

: the ratio of the angular speed of the initial or driving member of a gear train or equivalent mechanism to that of the final or driven member specifically : the number of engine revolutions per revolution of the rear wheels of an automobile.

Can you change the gear ratio on a shaft drive motorcycle?

With a shaft, you can’t change gear ratios like you can with a chain or belt by swapping sprockets or pulleys.

What does a bigger sprocket do on a motorcycle?

Gearing a bike up to produce higher top speed with less acceleration is done using a larger countershaft (gearbox) sprocket or a smaller rear sprocket. Gearing a bike down giving it more acceleration with lower top speed is done using a smaller countershaft (gearbox) sprocket or a larger rear sprocket.

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.

What is final drive ratio?

The final drive ratio is typically the gear ratio for the differential, or the final location where the gearing is altered before being sent to the wheels. … Raising the final drive ratio also means you’ll be at higher RPM in your top gear, raising your engine’s speed on the highway.

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