Stories from real people who are blending the outdoors with the everyday, the latest information about gear we love, advice to get you into a new activity or take your passion to the next level, and trip reports to help you plan your next adventure. Learn More. The 86mm bottom bracket is a relatively new, reasonably beefier BB standard that allows frame designers a little more leeway to play around with seat tube, downtube, and chainstay designs. The new, larger shell requires a larger bracket, obviously, and Shimano designed the Dura-Ace BB86 Bottom Bracket to quite literally fill the gap. While it's a little larger than traditional BBs, the BB86 has the same design as Shimano's other Dura-Ace brackets, with steel cartridge bearings packed inside composite cups and plastic o-rings and dust shields to keep everything running smoothly.
Shimano Dura Ace 9000 Bottom Bracket
Universal Cycles -- Bottom Brackets > Shimano Bottom Brackets
Is there a specific bottom bracket tool I'd need that's different from 9-speed, Ultegra etc? This appears to the current BB for the Dura-ace series: BB installation instructions The document states that the "TL-FC32" wrench must be used to install this bottom bracket, to a torque of N-m. What happened to unscrewing those caps with a paper clip? These are the same tools recommended for use with the current Ultegra series as well. Not sure if that is true for previous years' component sets though. This is different than the 9-speed from what I can see. What a PITA.
Shimano Dura Ace BB-R9100 Bottom Bracket Review
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