The array of bottom bracket standards out there these days is dizzying, but the folks at Wheels Manufacturing do a great deal to help. For example, if you have a frame with a 386EVO bottom bracket shell and a SRAM or Truvativ crankset with tapered 22-24mm spindle, the Wheels Manufacturing 386EVO Adapter for SRAM/Truvativ cranks is all you need, depending on your specific model. It's made of ultra-tough Delrin resin plastic, so it'll last. If you're unsure that it's what you need for your particular frame/crank combo, just give us a buzz or chat in and we'll get you squared away.