# Question: How To Know The Correct Lenght Of Bicycle Chain On A 21 Speed?

## 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 long should a bicycle chain be?

Using a ruler, a new chain should measure exactly 12 inches across 12 links, from middle of pin to middle of pin. The number most commonly agreed on for a worn chain is one percent elongation between links.

## How do I know what speed chain I need?

An 11 speed chain for example is narrower than a 9 speed chain, as the sprockets on the 11 speed cassette have a narrower spacing between them. Therefore, if you are using 11 speed transmission, then you require a 11 speed chain and so on.

## What is a chain stay?

What is the chainstay? The chainstay or “stays” = The pair of frame tubes that joins the bottom bracket shell to the rear axle holders (the slots the back wheel goes in). This means that the chain stays connect the bottom bracket (BB) to the center of the back wheel.

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## How can I tell if my bike chain is stretched?

Another ballpark method for checking chain wear is by measuring it with a ruler. Pick a rivet and line it up at the zero mark. Count 24 more rivets and your last rivet should be at the 12″ mark of your ruler. If it is off by more than 1/16″ your chain is stretched to the point of replacement.

## How long is a 520 chain link?

D.I.D 520 Standard Series Chain – 110 Links, Chain Type: 520, Chain Length: 110, Color: Natural, Chain Application: All 520 x 110.

## Does chain length affect speed?

Registered. Sprocket and gear size affect performance (speed/torque) The length of the chain will only effect your wheel base

## Are 11 and 12 speed chains the same?

12-speed chains can operate just fine with 11-speed cassettes. The main exception are Shimano’s new 12-speed HG+ models which are heavily optimized for downshifting and thus come with custom inner plates that don’t mix well with non-Shimano 12-speed components.

## What chain should I use for single speed?

If you have a single-speed bike or one with internal gears, the chain type will be 1/8″ in internal width. In this category you will find cruiser bikes, urban bikes, fixies or models with internal gears, among others. If you have a bike with a derailleur, with 2 to 11 sprockets, you will need chains of 3/32″.