Road bike bottom bracket Shimano 105 Press-fit - ISMBB7141B

Shimano Press-Fit bottom bracket designed for Hollowtech II cranksets

The Shimano SM-BB71-41B bottom bracket – ISMBB7141B is a replacement part for road bikes fitted with a frame featuring an 86.5 mm Press-Fit bottom bracket shell and a compatible Hollowtech II Shimano crankset.

Part of the Shimano range, this bottom bracket connects the frame to the crankset axle whilst ensuring smooth and precise rotation. Its Press-Fit design allows for direct integration into the frame, without the need for traditional BSA threading.

The SM-BB71-41B is specifically designated by Shimano as a Press-Fit bottom bracket for an 86.5 mm bottom bracket shell. It is constructed using resin spacers and has an advertised average weight of approximately 54 g.

Key features of the Shimano SM-BB71-41B

• Genuine Shimano bottom bracket.
• Part number: SM-BB71-41B.
• Product code: ISMBB7141B.
• Hollowtech II technology.
• Press-Fit mounting.
• Compatible with an 86.5 mm bottom bracket shell.
• Designed for Shimano cranksets compatible with a 24 mm axle.
• Resin adaptors.
• Average weight: approx. 54 g.
• Suitable for many Shimano road bikes fitted with a compatible Press-Fit bottom bracket.

Shimano SM-BB71-41B compatibility

The SM-BB71-41B is designed for frames fitted with the 86.5 mm Press-Fit standard, which is generally associated with the BB86 standard on road bikes.

It is recommended for use with various Shimano road crankset configurations featuring Hollowtech II technology. The technical tables at Shimano list it specifically as the recommended Press-Fit bottom bracket for several road cranksets.

Please note: the number of gears or the reference ‘ Shimano 105’ is not sufficient to determine compatibility. Before purchasing, it is essential to check:

• the frame standard
• the bottom bracket width
• the type of bottom bracket axle
• Hollowtech II compatibility
• the part number of the bottom bracket currently fitted.

Technical specifications

Why replace your bottom bracket?

There are several signs that may indicate a replacement is needed:

• creaking noises when pedalling;
• squeaking noises coming from the bottom bracket area;
• lateral play;
• uneven rotation of the axle;
• a sensation of rubbing;
• noisy bearings;
• signs of wear or corrosion.

Regular maintenance of the drivetrain and crankset helps to detect these problems before they become more serious.

Why choose the Shimano SM-BB71-41B ISMBB7141B?

The Shimano SM-BB71-41B ISMBB7141B bottom bracket is a suitable replacement for road bikes fitted with an 86.5 mm Press-Fit standard and a compatible Hollowtech II Shimano crankset.

A genuine Shimano part, lightweight and designed for the relevant configurations, it allows you to replace a worn bottom bracket whilst maintaining a setup that complies with Shimano specifications.

Before placing an order, you must check your frame’s standard and your crankset’s part number.