Interface Types
As well as the different means to fit the bottom bracket into the frame, there are a number of ways of connecting the crank arms to the bottom bracket spindle. Shimano introduced a proprietary splined interface named "Octalink". Several other manufacturers (King Cycle Group, Truvativ, and Race Face) created a competing open standard called "ISIS Drive" or simply "ISIS", for International Splined Interface Standard. The goal of ISIS was to increase interoperability of bottom brackets and cranksets. Previously, it was more difficult to match two components (from different manufacturers) to fit. Also, ISIS was designed to be stronger than the traditional square taper interface.
Read more about this topic: Bottom Bracket
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