Shimano - SM-BB71-41B Bottom Bracket-Pressfit Sunrace HDPolarized: Minimized glare via technology

HDPolarized: Minimized glare via technology that produces the best polarized lenses on the planet (optional)

To protect exterior areas exposed to the cold

Stan's Race Sealant's combination of large and smaller sealing crystals interlock to form a lattice work that not only seals but strengthens and reinforces the area of the puncture

Wrap-around frame for optimal protection

Shimano - SM-BB71-41B Bottom Bracket-Pressfit Sunrace HDPolarized: Minimized glare via technologyShimano SM BB71 41B is a press fit bottom bracket for the installation of a Hollowtech II compatible crank into a road frame with 86. 5 mm case width. Per usual with Hollowtech II, the bearings have a diameter of 24 mm, as this gives the best combination of rotational efficiency, stiffness, load capacity, tightness and weight even with press fit bearings. SM BB71 41B bottom brackets are recommended for older 10 speed road and cyclocross cranks.