Can I run 165 mm with 54/39?

Yes: Rotor Aldhu/Aldhu Carbon + 110x4 spider + 12-speed rings (round/oval). Check frame clearance and pick the BB by frame standard (BB86, BSA, T47).

Which BB for BB86 with a 24 mm axle (Shimano/Rotor 24)?

CyclingCeramic BB86 24 mm — smooth, durable, serviceable. Ideal for Shimano 12-speed and Rotor Aldhu24/3D24.

Aldhu Carbon 30 mm + a premium T47/30 ceramic BB (CyclingCeramic/Bikone) for top drivetrain efficiency.

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