The Shimano BB71A (model SM-BB71-41A) is a press-fit bottom bracket designed primarily for mountain bike (MTB) use.

Key Features:

• Type: PressFit BB92

• Shell Diameter: 41 mm

• Shell Width: 89.5 or 92 mm

• Axle Diameter: 24 mm (Hollowtech II)

• Material: Synthetic resin cups and centre tube, steel bearings

• Weight: Approximately 71 grams

Compatibility:

• Recommended for Shimano MTB cranksets including Saint (FC-M820), XT (FC-M780 series), SLX (FC-M670 series), ZEE (FC-M640), and Deore (FC-M610 series)

• Sealed bearings for smooth rotation and durability

• Designed for cross-country, all-mountain, downhill, and enduro riding

Technology:

• Uses Shimano’s Hollowtech II system integrating the bottom bracket axle with the crank arm for increased stiffness and reduced weight.

• Outboard bearing system improves pedaling stability and power transfer efficiency.