Shimano Hollowtech II: 24mm axle, threaded into the bottom bracket shell via right/left cups. Standard since 2003.
SRAM GXP: 24/22mm axle (left smaller), single bearing shouldering the axle. SRAM standard until DUB.
Hollowtech II BSA cups: 35-50 N·m SRAM GXP BSA cups: 34-41 N·m GXP central bolt: 48-54 N·m
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Source: Official workshop manuals
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