Building up a new frame with a 386EVO bottom bracket? Running a Shimano crankset? Great. All you need is the Wheels Manufacturing 386EVO Bottom Bracket Adapter for Shimano Cranks. It's made of ultra strong Delrin resin plastic, so it'll last as long as your Shimano parts do. Unsure that it's what you need for your specific crank/frame combo? Just give us a call or chat in and we can answer any questions you may have.