What does the spindle designation number mean? Some spindle materials may be forged, although the process must usually be accomplished using multiple forging steps. The spindle designation number is the nominal distance between the crank stops on the spindle. Since all the spindles in the standard are symmetric about the BB shell mid-plane (theoretically the frame centerline), one-half the spindle designation number is the distance from the BB shell mid-plane to the drive-side crank stop on the bottom bracket. By adding this number to the “chainline offset” provided by the crankset manufacturer, you can easily figure out the resulting chainline of that particular crank assembled onto any ISIS Drive bottom bracket of a given designation. Maybe you want to turn a hobby into something more. Or maybe you have a creative project to share with the world. Why use the spindle designation number instead of the overall length? Whatever it is, the way you tell your story online can make all the difference. The entire ISIS Drive system is based on the crank stops of the spindle. Everything in the standard is derived from these crank stop “datum planes”, including the method of measuring a spindle.
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