If the frame has BB86, or more likely PF86 or BB386 EVO, then you would need a corresponding bottom bracket that fits, and depending on what kind of crankset you want to run, you have to get the right one. So you have two things you to worry about when picking the bottom bracket: the bottom bracket type (standard 24/BB30/PF30/PF86/BB386/etc.), and the crankset type you want to run (Shimano Hollowtech II/SRAM GXP/Campagnolo PT/UT/etc.). Now if you just tell us what frame this is, we can probably tell you what it has.