Frames with BB86 press-fit shells need a bottom bracket that matches both the 86.5mm width and 41mm inner diameter while accepting a 24mm crank spindle. The Dura-Ace SM-BB92-41B from Shimano checks all three boxes and does so at 54 grams, which is 11 grams lighter than the previous SM-BB9000 it replaced. If your road frame uses the BB86 standard and you're running any Shimano Hollowtech II crankset, this is the factory-spec bottom bracket that pairs with it.

The bearing design uses smaller diameter steel balls than typical bottom brackets, which is where the weight savings comes from without compromising load capacity. Shimano engineered the seal construction specifically for this application, creating a barrier that keeps water and grit out of the bearing races while maintaining low rotational resistance. The high-pressure resin cups press into the frame shell and provide a stiff interface that eliminates the flex and creaking that can plague poorly designed press-fit systems when everything is installed correctly.

Crankset compatibility extends across Shimano's entire road lineup with Hollowtech II spindles, including current Dura-Ace R9200, Ultegra R8100, and 105 R7100 12-speed cranks, as well as the previous generation R9100, R8000, and R7000 11-speed versions. The 24mm spindle diameter is the common thread, so older 10-speed cranks from the 7900 and 6700 era also work. You can technically run other brands' 24mm cranks with this bottom bracket, though Shimano doesn't officially support those combinations.... Read More