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Presuming a replacement is necessary, and not a new build, can you remove the cranks and measure the the spindle length? You can do it with the BB still installed if the caliper arms are 'deep' enough. While you are in there with calipers, its probably worth getting the BB Shell diameter and width too. Another variation is the thread's hand orientation ...


A lot of mystique grows up around the regulation of many sports. The key (as Neo says) is to get to the source ... UCI regulations say Section 2: bicycles Preamble Bicycles shall comply with the spirit and principle of cycling as a sport. The spirit presupposes that cyclists will compete in competitions on an equal ...

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