Shimano Dura-Ace R9100 Hollowtech II English Bottom Bracket Cycling Parts with an Achilles Flex Zone

with an Achilles Flex Zone for uphill mobility

form fit jersey with elongated sleeves keeps you dry and comfortable no matter the distance or time in the saddle

The mountainFLOW eco-wax SKIN WAX is water based and non toxic

FlickLock® Pro adjustability and a three-section foldable shaft

The Lumina Micro headlight is small

Shimano Dura-Ace R9100 Hollowtech II English Bottom Bracket Cycling Parts with an Achilles Flex ZoneThe Shimano Dura Ace R9100 bottom bracket is the English threaded bearing unit for Hollowtech II cranksets at the top of Shimano's road lineup. Designed for frames with 68mm or 73mm BSA threaded shells, it provides smooth, low friction rotation built to Dura Ace standards. Preload adjustment is handled externally, making installation and fine tuning straightforward with a standard bottom bracket wrench. Compatible with Dura Ace and Ultegra Hollowtech