SM-BB71 mates 24 mm Hollowtech II spindles to PF86/92 shells with low-drag bearings and robust labyrinth seals built for monsoon grit and long commutes.
SM-BB71 mates 24 mm Hollowtech II spindles to PF86/92 shells with low-drag bearings and robust labyrinth seals built for monsoon grit and long commutes.
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