Shimano Sm-Bb71-41b

Press-Fit Bottom Bracket 86.5 mm

• Sealed bearing
• Easy to install
• For 86.5 mm frames
• Reference: ISMBB7141B

How can I identify my bottom bracket? Learn more about it.

Does your bike creak when you pedal hard? Is the movement of the crankset no longer smooth or feels loose? The symptoms are clear: it’s time to replace your bottom bracket. Like all parts of your bike, the bottom bracket and especially its bearings are subject to wear. Replacing it is a straightforward process when well-prepared. The variety of bearing, bottom bracket, and frame standards may be daunting to some. We will try to guide you through this jungle of standards. The bottom bracket is the interface between your crankset and your frame. Therefore, you first need to determine which crankset fits which frame.

Shell inner diameter, box width, mounting standard, recommended bottom bracket axle:

• 34.8 mm, 68 mm, screw-on, BSA / BSC, 24 mm / GXP / Dub
• 29 mm, 36 mm, 70 mm, screw-on, Italian, 24 mm
• 37 mm, 90.5 mm, press-fit, BB 90 (Trek), 24 mm / GXP / Dub
• 29 mm, 41 mm, 86.5 mm, press-fit, PF 86 (Shimano), 24 mm / GXP / Dub
• 29 mm, 41 mm, 89.5 mm, press-fit, PF 90 (Shimano), 24 mm / GXP / Dub
• 29 mm, 42 mm, 68 mm, press-fit, BB 30, 30 mm / Dub
• 29 mm, 42 mm, 79 mm, press-fit, BB Right, 30 mm / Dub
• 29 mm, 46 mm, 61 mm, press-fit, Specialized, 30 mm / Dub
• 29 mm, 46 mm, 68 mm, press-fit, PF 30, 30 mm / Dub
• 29 mm, 46 mm, 79 mm, press-fit, BB Right PF 360, 30 mm / Dub
• 29 mm, 46 mm, 86.5 mm, press-fit, 386 EVO, 30 mm / Dub

We recommend disassembling your original bottom bracket to accurately measure the dimensions of your frame's bottom bracket. This compatibility is provided as a guideline; there are also "adapter" bottom brackets that allow mixing of standards.

Specifications:
Shell width: 86.5 mm
PressFit bottom bracket standard: Shimano
Shell inner diameter: 41 mm
Bearing quality: Steel
Bottom bracket axle: 24 mm
Crankset standard: Shimano Hollowtech II.