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A similar search on 'hollow tech bottom bracket lifespan' will reveal similar Internet stories of bearing failing prematurely to what you found for SRAM GXP.
External BB life span depends on riding conditions, the sealing of the bearings and the installation .. has the BB she'll been faced so the bearings are parallel, is the preload on the bearings to much etc.
Oswald
@ptr
I've bought a SRAM rival gruppo for a new build but a quick search suggests GXP bottom brackets arent up to much... as in, they turn to dust within 500km.
I need to pick up a new BB as frame is Italian. Merlin has the SRAM red ceramic for an Italian thread reduced down to £40, worth it over a standard steel setup for £20?
Or just ditch the crankset and replace with Shimano? Hollowtech II seems to just be fit and forget, rarely hear problems.