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External housing for the crankshaft.

Vertically split[edit | edit source]

Vertical crankcases are crankcases that are split vertically.

Horizontally split[edit | edit source]

The crankcase has a seam on the horizontal plane. Horizontally split crankcases were a major innovation when they were first introduced. They caused the bikes that featured them to be FAR less prone to oil leaks.

Cassette type[edit | edit source]

The gears are loaded in from one side.