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Why two bolt sizes?

April 26, 2017bolt

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Why two bolt sizes?

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A bicycle is used in many different ways, from leisure riding around the block to radical 30-foot drop-offs. Each riding applications places different requirements on the crankset and bottom bracket. Thus, we included two bolt sizes in this standard to allow manufacturers and riders to choose the best ISIS Drive bottom bracket for their needs. An ISIS Drive crank is compatible with either bottom bracket size, be it M12 or M15. Since the bottom bracket determines the bolt size, the ISIS Drive standard specifies that the correct bolt size should to be included with the bottom bracket.