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Removing a crankset is a useful skill to have because it will allow you to replace an old crankarm, clean or replace a worn chainring, or work on the bottom bracket.
Some cranksets are held in place by a hexagonal bolt, which can be removed with a crankset socket wrench (see Step 1). Other cranksets are equipped with self-removing Allen bolts, which can be detached with an 8mm Allen key (see Step 2).
When refitting a crankset, keep grease or oil from touching the axle. The crankset must be dry when fitted to the axle or it will work loose. After refitting, go for a short ride and then try the axle bolt again. If it is slightly loose, you should tighten it.
Step 5 shows how to remove a chainring so that you can replace one that is worn, or fit a bigger or smaller chainring that will provide you with different gear ratios.
Below: Parts of a crankset.
Removing a crankset
1. Detach a hexagonal crankset bolt from the axle with a crankset socket wrench.
2. Unscrew a self-removing Allen bolt with an 8mm Allen key. These bolts extract the crankset as you unscrew them.
3. Use a long-handled Allen key if there is an Allen bolt holding the crankset on your bike. Usually, an 8mm key is the size required.
4. Use a crankarm extractor to remove the crankset if it is not the self-removing type.
5. Remove the chainring with a 5mm Allen key on one side and a chainring bolt peg wrench to hold the bolt on the other. You can do this without taking the crankset off the axle, but you must remove it if you are working on the inner rings of some triple cranksets.
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