SHIMANO BB-7900 Dura Ace Bottom Bracket Review Posted by GiantPandaisy June 28, 2018 in Drivetrain Components This fits your . Make sure this fits by entering your model number. Shimano America Dura Ace 7900 Bottom Bracket One Color, 7900, English Shimano Dura-Ace 7900/7950 Bottom Brackets. Cycling Outdoor Recreation Parts & Components SHIMANO Sports & Outdoors