One more Bottom Bracket discussion!!!

I have a BBright Frame, looking for a short crank (165) and a big gears (53/39)... and there are basically no aftermarket 24mm crank that will work.

I had great success with the wheelsmfg BB in the past... they don't offer a BBright to 30mm. I think they could swap the bearing on request. just wandering it's a good idea?
(fit, baring life, more creak, stiffness)


Also, could someone explain to me why the 30mm (bigger) are lighter?
https://www.sram.com/sram/road/products/sram-red-crankset-0
(similar with rotor)