# Are there different size bike chains?

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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. ⁄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.

## How do I know my bike chain size?

Begin by counting the number of teeth on the largest front sprocket and largest rear. These numbers are often printed right on the sprockets and cogs. Next, measure the distance between the middle of the crank bolt to the rear axle. This is also the chain stay length.

## How do I know my chain size?

Go-kart chain numbers take the first letter from the pitch. And the last 1 or 2 digits from the roller width. For example a 420 chain has a pitch of 4/8-inches and a 520 chain has a pitch of 5/8-inches. To start measuring your chain size you need to start at the sprocket.

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## What is a 3/32 bike chain?

3/32″ (0.094″, 2.30 mm) chain is used on derailer equipped bicycles that have more than 3 cogs at the rear. Even somewhat narrower chain, typically . 090″ or 2.29 mm between the inner plates, is used for derailer-equipped bicycles with 9 or more sprockets at the rear.

## Can all bike chains be shortened?

They are not; the process to shorten a chain on an MTB is similar to what we have described here. You need to mount the bike, clean the chain and then if you have a chain tool, use it to remove extra links. If you don’t have a chain tool use a small nail and a pair of pliers to get the pins out of the links.

## What is the standard bike chain size?

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. ⁄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.

## How do I know if my bike chain is too short?

You should also see two slight bends at each jockey wheel of the rear derailleur. 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. If the chain is really short, then you might not even be able to shift into the largest cog.

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## How do I know my roller chain size?

Most roller chain has the size stamped right into the side plates. You may see something like “40”, “C2080H” or “10B” stamped in, which the industry number that represents the chain size. Old chains will most likely need to be cleaned in order to see the size.

## What size is 08B chain?

08B Roller Chain dimensions – ISO R606

Chain No. DIN P x W Width W (mm)
08B-1 1/2 X 5/16″ 7.75
08B-2 1/2 X 5/16″ 7.75
08B-3 1/2 X 5/16″ 7.75

## What size is 40 chain?

Chain standards

Size Pitch Maximum Roller Diameter
25 0.250 in (6.35 mm) 0.130 in (3.30 mm)
35 0.375 in (9.53 mm) 0.200 in (5.08 mm)
41 0.500 in (12.70 mm) 0.306 in (7.77 mm)
40 0.500 in (12.70 mm) 0.312 in (7.92 mm)

## 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.

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

1/8″ chains are used exclusively for single speed setups. There is some confusion in these numbers because the actual width of a 1/8″ sprocket is typically 1/8″(3.175 mm) and the gap between the inner side plates of the chain must be slightly wider to fit over the teeth.

Modern bike chains are properly called ‘roller chains’, and consist of short cylindrical rollers held together by side links. The gaps between the rollers mesh with the teeth on a sprocket or chainring, to drive the transmission when turned.

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Replacement Pin or Master Link: New chains will come with either a new pin, or a specialized link called a master link, to connect the two ends of the chain together.

## When should I shorten my bike chain?

Ideally, you want to shorten your replacement chain after threading it through the chainrings and cassette. This makes it easier to determine how long your chain needs to be. Before threading the chain, however, check whether there are signs of extreme wear on the chainrings and cassette on your bike.