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Shimano Hollowtech bottom brackets are quite common on modern road bikes, although other systems are regularly seen too. Shimano Hollowtech Bottom Brackets are fairly simple to remove and fit, although a special tool is required to remove the cranks. When replacing the cranks, make sure they are securely fastened, as a damaged pair can be expensive to replace.
This is a long guide, so you can choose to either watch the entire video above, or follow it in smaller chunks by clicking on the individual steps below.