Left and right bottom bracket cups with standard bearings for FSA MegaExo cranks. BB-9050 is for 24mm spindle 68/73mm MTB K-Force and Team Issue cranks. BB-8681 for K-Force Light (a non-ceramic option) and SLK Light Road MegaExo cranks (BB-8681 bearing covers have been redesigned so that the spindle now rides directly on the bearing itself). BB-7000 is for 24mm spindle 68/73mm shell MTB Gravity Lite, Moto X and Afterburner cranks. BB-7000 is for 24mm spindle 83mm shell MTB Gravity Lite cranks. BB-6200 is for 24mm spindle 68mm shell Energy, Gossamer and Omega No Bolt Design cranks. BB-6000 is for 24mm spindle 68mm shell Energy, Gossamer and Omega cranks. BB-4000 is for 19mm spindle 69mm shell Omega cranks. BB-1000 is for 19mm spindle 68/73mm MTB Gamma cranks. 1.37" x 24tpi (English threads) or M36 x 24tpi (Italian threads)