Shimano bottom bracket SM-BB71-41B – Pressfit and Hollowtech II
Shimano SM-BB71-41B is a pressfit bottom bracket for the installation of a Hollowtech II cranks in a Road frame with 86.5 mm shell width. As usual with Hollowtech II, the bearings have a diameter of 24 mm, because this is also the best combination of rotational efficiency, rigidity, load capacity, tightness and weight for press-fit bearings. SM-BB71-41B bottom brackets are recommended for older 10-speed Road and Cyclocross cranksets.
Application: Road, Cyclocross
Type: Pressfit BB86
Shell Diameter: 41 mm
Shell Width: 86.5 mm
Axle Diameter: 24 mm (Hollowtech II)
Bottom Bracket Cup Material: resin
– recommended for Ultegra FC-6700, FC-6700 G, FC-6750, FC-6750 G, FC-6703, FC-6703 G / 105 FC-5700, FC-5750, FC-5703 / Tiagra FC-4600, FC-4650, FC-4603 / Sora FC-3550, FC-3503 / FC-CX50 / FC-R603, FC-R563, FC-R460, FC-R350
The externally mounted bottom bracket offers better weight distribution and stability for more efficient power transmission. The diameter of the bottom bracket axle and the bearing (24 mm) was an important factor in the development, as the bottom bracket axle has a significant impact on stiffness, stability, weight and rotational efficiency.
Manufacturer Part Number:
– 1 x Shimano SM-BB71-41B right bearing cup, incl. bearings
– 1 x Shimano SM-BB71-41B left bearing cup, incl. bearings
– 1 x Shimano centre tube