Shimano Dura-Ace SM-BB92-41B Hollowtech II Press Fit Bottom Bracket Eligible Product Durable plastic construction

Durable plastic construction

237g(Presta) & 245g(Schrader)

Schwalbe Presta Valve Extension

Sealed cup and cone bearings

Shimano Dura-Ace SM-BB92-41B Hollowtech II Press Fit Bottom Bracket Eligible Product Durable plastic constructionWith an advanced seal construction for smoother rotation, the Dura Ace is still lightweight at 54 grams. Shimano precisely engineers their highest quality steel ball bearings for this unit and with the seal effectiveness improved, infiltration and corrosion are incredibly unlikely, even with regular bike cleanings during the rainy seasons or during cyclocross. Model no: SM BB92 41B Series: Dura Ace R9100 Weight: 54g Discipline: Road Press fit bottom