# Often asked: How To Figure Out A Bike Sprocket Size?

## How do I know what size sprocket I need?

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.

## How do you measure a bike sprocket?

To measure the chain size, if you have just the sprocket, use calipers to measure between the teeth. Measure from center to center of where the chain roller would set between the teeth that will give you the pitch. Once you know the pitch you can determine what chain size you would need.

## How do I know if my bike is 10 or 11 speed?

Multiply the front gear number by the rear gear number to get the number of speeds. For example, if you have two front gears and five back gears, you have a 10-speed bike.

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## What does the number of teeth on a sprocket mean?

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.

## Is a smaller 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).

## What sprocket is best for top 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.

## What size chain Does my bike need?

If your bike is equipped with the derailleur, you need a 3/32″ or 11/128″ chain. If you have a single-speed or internally geared bike, you need either 1/8″ or 3/32″. You should get the correct size, but if it is not possible, you can get the 1/8″ because it has limited compatibility with the 3/32″ sprocket.

## How do I know my bike gear ratio?

Gear Ratio is the ratio of revolutions of the cranks to revolutions of the rear wheel.

1. Gear Ratio = Number of Teeth in Chain Ring ÷ Number of Teeth in Rear Cog.
2. Gear Inches = Diameter of Rear Wheel x (Number of Teeth in Chain Ring ÷ Number of Teeth in Rear Cog)
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## Is my bike chain too short?

If the chain is too short, this shift is difficult to make and the derailleur cage is stretched out and almost parallel to the chainstay. Then, if you shift into the smallest chainring and smallest cog and if the rear derailleur pulls the chain back so far that it comes in contact with itself, the chain is too long.

## Which gear is 1 on a bike?

Downshifting, or decreasing the resistance, allows for faster and easier pedaling; upshifting, or increasing the resistance requires more effort and builds endurance. On your shift lever, the lowest number, No. 1, represents first gear.

## What does 10 speed mean on a bike?

A 10-speed bike is a type of road bicycle that allows you to change the pedaling resistance through a shifting mechanism. The various gears provide up to 10 different resistance settings, or speeds. This type of bicycle engineering makes riding on hilly terrain over long distances easier.

## Is my bike a 9 speed?

When magazines and websites talk about a bike’s ‘speed’, it’s a reference to the number of sprockets. A bike with three chainrings and nine sprockets is 9-speed, even though it has 27 theoretical ratios.

## Is more teeth on a sprocket better?

The two sprockets are measured by their number of teeth. As a quick rule of thumb, the more teeth on the rear sprocket, the lower the gearing. Conversely, the fewer teeth on the countershaft sprocket, the lower the gearing.

## What’s the best sprocket size?

For taller gearing, a one-tooth-larger countershaft sprocket is often the best bet. For more subtle changes, combine that plus-one-tooth front sprocket change with a minus-one-tooth change at the rear sprocket.

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## 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.