How does the spindle gage work?
The spindle master gage is essentially a perfect crank that slips onto the spindle. This perfect crank contains GO/NO-GO indicators that allow the determination of whether the flute geometry is within the tolerances required by the ISIS Drive standard. The GO/NO-GO indicators are based upon the distance the tool sits away from the crank stop located on the spindle. This tool does not measure clocking between the spindle ends, which is left to the manufacturer of the bottom bracket spindle.
