I search the web,the answer is BBright™ (bicyclestoparts)is the onlyBottom Bracket standard that uses an oversize 30mm axle and allows foroversized frame tubes (up to 16% wider than standard bottom brackets). It offers the optimal combination ofstiffness and weight for the overall system (crankset and frame together). But I still don't understand. BBright just wide than the BB30?or is better than BB30?