Shimano SM-BB72-41B Ultegra Hollow Tech II Press Fit Bottom Br Bike-Storage-Travel Case Accessories Sil-Tec surface treatment technology (PTFE

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

iPhone iPhone 4S and newer

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

Low stack height (-0

Shimano SM-BB72-41B Ultegra Hollow Tech II Press Fit Bottom Br Bike-Storage-Travel Case Accessories Sil-Tec surface treatment technology (PTFEBB86 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