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@sam_singular
Oh, sorry, also should have mentioned there is a big difference between hollowtech and hollowtech 2. The first generation used an oversized hollow bb axle and stuffed it all in a standard sized shell. this necessitated use of much smaller bearings and these definitely do suffer from shorter bearing life. However when it all went external the bearings increased in size again and it's all good. As in the previous post though externally mounted bearings rely on a correctly faced bb shell and a closer range of torque tolerance than square tapers.