TruVativ Powerspline bottom bracket
This is the bottom bracket you'll need to use with a SRAM S100 crankset if you want to have a good chainline.
No, you can't use something else.
• 68mm English threaded (1.370" x 24tpi)
• spindle length: 113mm
• proprietary spline design for SRAM/TruVativ cranks
• includes crank arm bolts
• requires Park Tool BBT-22 for installation & removal