# How To Measure Sprocket Chain Size For A Bicycle?

## How do you measure a sprocket chain?

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 you measure a bike sprocket?

The most common chain sizes are 40,50,60 and 80. If the size is not stamped on the chain, use calipers to measure between the teeth. Measure from center to center of where the chain roller would set between the teeth. (This is also known as Chain Pitch) Measure to the nearest.

## What size chain is a bicycle chain?

Chains come in 3⁄32 in (2.4 mm), 1⁄8 in (3.2 mm), 5⁄32 in (4.0 mm), or 3⁄16 in (4.8 mm) roller widths, the internal width between the inner plates. 1⁄8 in (3.2 mm) chains are typically used on bikes with a single rear sprocket: those with coaster brakes, hub gears, fixed gears such as track bicycles, or BMX bikes.

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## Will 40 chain fit 420 sprocket?

They are the same pitch (1/2″) but 420 is narrower used primarily on the thin, lightweight kart sprockets. 40 chain will run on a 420 sprocket but I think it will have way too much side to side play.

## 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).

## How do I know my bike chain size?

Add the multiplied chainstay length, the divided number of teeth for the chainring and rear sprocket, and add 1 (or 2.5 cm). The result is the ideal chain length for your bike. For example, you’d add 32.5, 13, 7 and 1 to get 53.5. The length of the chain should be 53.5 inches or 135.89 cm.

## How do I know what speed my bike is?

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. If you have one front gear and three back gears, you have a 3-speed bike.

## How do I know what gear ratio My bike is?

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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## What is the difference between bicycle chains?

Chains can vary in side plate shape, sizing, and height. Differences can cause variations in shifting performance between brands and models. Additionally, chains will vary in the quality of steel used. Better chains that are more durable and longer lasting tend to have harder rivets.

## How often should I change my bike chain?

The 2,000-Mile Rule. To avoid this accelerated wear of your cassette and chainrings, a general rule of thumb is to replace your bike’s chain every 2,000 miles. Mind you, this is just a starting point. No two chains will wear at exactly the same rate because no two riders treat their chains the same. 4

## What size bike chain do I need single speed?

1/8″ chains are used exclusively for single speed setups. In addition to the other answers, I found it helpful to read that the nominal width of a chain (1/8 or 3/32) actually refers to the width of the sprocket.

## Will 420 chain fit a 428 sprocket?

A 420 and 428 are the same except width and the pins may be a little bigger diameter on the 428. They shouldn’t be though.

## Will a 35 chain fit a 40 sprocket?

No. A #40 chain is 1/2″ between the pins and 5/16″ inside width. A #35 is 3/8″ between the pins and 3/16″ inside width. There is no way it will work.