# How do you calculate the length of a chain?

## How do you calculate the length of a chain?

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 if my mountain bike chain is too long?

If the chain is really short, then you might not even be able to shift into the largest cog. 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.

## What size is a 420 chain?

Metric Dimensions

Chain Pitch Roller Diameter
420 12.70mm 7.75mm
428 12.70mm 8.51mm
520 15.88mm 10.16mm
525 15.88mm 10.16mm

## What size is 40 chain?

What size is a 40 chain?

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

## How long does a MTB chain last?

A typical mountain bike chain will last 750 miles of single track riding. It’s not easy to gauge exactly how long a chain will last, but there are ways to prolong the life of the chain.

## How long does a chain last?

A chain can last anywhere from about 500 miles to 5000, depending on the quality of the chain, the sprockets, how the bike is ridden, and the maintenance. I clean my chain about twice a year, whether it needs it or not, and I get about 2000 miles out of mine.

## How tight should MTB chain be?

How tight should a bike chain be is regularly asked by mountain bikers? The chain should be tight enough that it only allows you to move it up and down about half an inch. If there is no slack in the chain then it is too tight. And if there is too much slack then you need to tighten that chain.

## What is chain pitch?

Chain pitch is the size of the chain and is defined as the distance between any three consecutive rivets divided by two. The easiest way to determine the pitch of your chain is to look at the number stamped on the drive link.

## Will a 420 chain fit a 35 sprocket?

#420 will fit on #41 sprockets, its just a little bit heavier duty with a larger pin. DIFFERENT CHAIN SIZES- explained #35 Chain will ONLY fit #35 sprockets, no questions asked. #41 Chain will only fit #41 sprockets, #40 sprockets are too wide.

## How do you measure the length of a bike chain?

How to Measure a Bike Chain. If you’d find the measurement without handling a chain, use a mathematical equation. By counting the number of teeth in the chainring and sprocket, as well as measuring the length of the chainstay, you can determine how long the chain should be.

## How big is a brand new bike chain?

A brand new chain will measure 12 inches across 12 links, so if you measure your chain and it is 12 1/16 inches across 12 links then it’s time to replace it. If it is stretched even further, it has most likely damaged your cogs. The first thing you’re going to need to know is the necessary length for your new chain.

## What causes a bike chain to lengthen over time?

As the driving force of the bike, your chain sees a lot of wear and tear. Over time, distance, and cycling conditions, the rivets and rollers begin to wear out, causing the chain to actually stretch in length.

## What’s the length of a derailleur bike chain?

For example, some derailleur bike chain could only be 51, 52, 53 inches, etc. Chains cannot be cut to 52-1/4″, 53-1/8″, or even 52-1/2″. It is possible to determine chain length from industrial drive train equations, and then cut the chain before installing it on the bike.