The cup & cone style BB are more adjustable (can get a perfect smoothness) and more serviceable, so it can perform its required functions for a long time.
Bearing : Steel balls
Ball Race : Standard
Axle : "SG75 taper"
Cup Thread : BC1.37x24T
Shell Width : 68mm
As SG75 Series use a proprietary taper called "SG75 taper", SG75 crank should only be used on SG75 bottom bracket.
For more detailed information, please check ;
"Important Information on SG75 Taper"
BB SG75 Installation guide
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