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Campagnolo use competing standards in square taper, viz. JIS and ISO respectively, where the ISO spindle is longer and its taper end is slightly smaller. Most parts made by European manufacturers are to the ISO standard, and most Asian manufacturers use the JIS (Shimano) standard), and two orientations: diamond and horizontal square. The hole in the crank in which one screws a crank puller almost always has a diameter of 22 mm, though some old French cranks (Stonglight and T.A.) require a different puller.

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