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there are 25.4 mm in one inch. so a 2 inch gauge will equal a diameter of 50.8mm. so if the dimensions are truly what they call out, the difference between a 2 inch gauge and a 52mm gauge is about .047 of an inch (about the thickness of a key). a 2 inch should fit in a 52mm cluster where the 52mm will not fit in a 2" cluster.
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