Shimano SM-BB72-41B Ultegra Hollow Tech II Press Fit Bottom Br Bike-Storage-Travel Case Accessories Lightweight CrN/Ti Alloy rails

Lightweight CrN/Ti Alloy rails

reducing foot movement and increasing power transfer from rider to road

The Varia app has you covered if you're using your phone as a primary or backup display

Sil-Tec surface treatment technology (PTFE plating) on inner links that is smooth running and increases durability

Shimano SM-BB72-41B Ultegra Hollow Tech II Press Fit Bottom Br Bike-Storage-Travel Case Accessories Lightweight CrN/Ti Alloy railsBB86 Press fit Ultegra 105 bottom bracket Shimano, SM BB72 41B, Press fit, BB Shell: 86. 5mm, Dia.: 41mm, Axle: 24mm, Steel, Grey, ISMBB7241B Compatible with all road Hollowtech II cranks