# How long should my mountain bike chain be?

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## How long should mountain bike chain be?

Line up the rivets on a ruler, the chain should be 12 inches across 12 links. If it is off, chances are your chain is in need of repair/replacement. There are tools to check the wear of the chain. Mountain bikers have many opinions on the best tool.

## What size chain does my mountain bike need?

The method of chain sizing depends upon the range of gearing in the system. For bikes with rear sprockets 36 teeth and smaller, the common system is to measure using the largest rear sprocket and largest front ring as a reference. Two rivets are added to this (one-inch) for the place to cut the chain.

## What length of bike chain do I need?

In order to make absolutely sure the chain is long enough, it should be put around the biggest chainring in the front, the biggest sprocket at the rear and then add one more inch, i.e. one link because of the derailleur (one link consists of a pair of outer and inner plates, as shown in the picture below – it is often …

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

Do a simple check on your bike by shifting the chain to the big chainring and the biggest cassette cog; then, push on the end of the derailleur cage (pushing forward) to see how much it will move forward. If it moves just a little, then you’re good. If it moves a lot, then you’ve got too much chain.

## How do you calculate chain length?

L = 2 (C) + (F/4 + R/4 + 1) L = Length – your chain length in inches (rounded to the nearest inch). C = Chain stay – the distance between the middle of the crank to the rear axle. Measure to the closest ⅛ and convert this to decimal form.

## How many miles should I replace my bike chain?

Replacing your chain regularly can prolong the life of your drivetrain. Most mechanics agree that you should replace your chain about every 2,000 to 3,000 miles, depending on your riding style. Many Tour De France riders wear out two or even three chains on their primary bike over the course of the three-week race.

## Are 7 and 8 speed chains the same?

Shimano, SRAM and Campagnolo all use the same chain with 8 speeds. Chain for 7 speeds is a bit wider – 7.3 mm, while a 6 speed one is substantially wider – 7.8 mm. … Going further narrower, like a 10, or 11 speed chain on an 8 speed cassette can and often does work.

## How do you know what chain to buy?

When selecting a chain, the first consideration is the number of rear sprockets. The rear cog sets have been made with 5, 6, 7, 8, 9, 10, 11, or 12 sprockets. As the number of cogs on the rear hub increases, the spacing between cogs tends to be reduced.

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## Do I need to shorten my bike chain?

You will probably have to remove a few links unless the chain was too short before. As long as there is minimal tension on the chain in the little/little combo, and the chain does not rub on the RD cage, then the chain does not need to be shorter.

## What is a chain measurement?

The chain is a unit of length equal to 66 feet (22 yards). It is subdivided into 100 links or 4 rods. There are 10 chains in a furlong, and 80 chains in one statute mile. In metric terms, it is 20.1168 m long.

## Do I need a longer chain for a bigger cassette?

You need a bit longer chain for a larger cassette. All things remaining the same, if your chain was the correct length before, adding the 34t gear increases the diameter of the low gear. That increases the total gear length, so you would have to have more chain to keep the adjustment correct.

## How do I know if my chain is too loose?

Check the chain slack while the Chain Monkey is in place. If there is still slack present in the chain, your chain is too loose and you will need to adjust and align your wheel until the slack is removed.

## What happens if bike chain is to long?

If the bike chain is too long it will cause problems when changing gears as you shift gears and the derailleur can’t pick up the extra chain length. As a result, the chain may keep slipping off. … Your front and rear derailleur are not properly aligned. The chainring, derailleur, or the chainring are damaged.

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