Shimano SM-BB71-41B Hollowtech II Press Fit Bottom Bracket ISMBB7141B

Shimano SM-BB71-41B Hollowtech II Press-Fit Bottom Bracket | The Foundation of Precise Power Transfer for PF41-86.5 Standard

Shimano Hollowtech II compatible with technology, Press-Fit PF41-86.5 Specifically designed for standard frame hubs, this bottom bracket is one of the most critical and quiet components in your road bike's drivetrain. Ultegra offering quality at this level SM-BB71-41B combines high rigidity, low weight, and superior sealing performance, providing the perfect balance for 24mm Hollowtech II axles. Here's a comprehensive description, packed with technical details, for search engines and informed consumers:

⚙️ Technology and Design: Flawless Compliance with Press-Fit PF41-86.5 Standard

This product is commonly used in modern road bike frames. Press-Fit PF41-86.5 It is manufactured to standard specifications. Unlike traditional threaded hubs, the bearings are mounted to the frame hub. press-fit It is assembled. The equivalent of this design in SM-BB71-41B is as follows:

• 📐 Precise Measurements: Shell Width: 86.5mm And Shell Diameter: 41mm . These dimensions must be specified in your frame's technical specifications. Correct fit is vital for smooth rotation and long service life.

• 🎯 24mm Hollowtech II Axle Compatibility: The product is integrated with the right crank arm, forming the basis of Hollowtech II technology. 24mm diameter stainless steel axle It is optimized for this purpose. This balance of diameter, weight, stiffness, durability and sealing has been determined by Shimano engineers. It is the ideal balance .

• 🏗️ Outboard Bearing System: The bearings are not embedded within the frame, but are mounted on the outside of the frame hub via these cups. This allows:

  • Larger bearings can be used, which It increases durability and lifespan .

  • Power transmission is more efficient and stable. becomes.

  • By optimizing the distance between the crank arm and the frame (Q-Factor) more natural pedaling comfort This ensures and reduces heel clearance.

🔩 Installation and Materials: Durability and Ease of Use

• 🛠️ Installation: Press-Fit systems require a specific pressing force for installation and special press tools This requires proper and damage-free installation. It is strongly recommended that this process be performed by an experienced bicycle mechanic. Incorrect installation can result in permanent frame damage or unwanted noises such as "squeaking".

• 🧱 Ingredients: Body high-strength resin (polymer) It is made of a material that, in addition to being lightweight, provides a connection between the frame hub and the bed. a natural vibration damper It contributes to driving comfort by performing this function and prevents potential noises caused by metal-to-metal contact.

🚴 Wide Compatibility: Which cranksets does it work with?

SM-BB71-41B, the following 24mm Hollowtech II axle Compatible with all Shimano road cranks. The list shows how extensive the product's usage history is:

• Ultegra: FC-6700 / FC-6700G / FC-6750 / FC-6750G / FC-6703 / FC-6703G (10-speed)

• 105: FC-5700 / FC-5750 / FC-5703 (10-speed)

• Tiagra: FC-4600 / FC-4650 / FC-4603 (10-speed)

• Sora: FC-3550 / FC-3503 (9-speed)

• Cyclocross: FC-CX50

• Compact & Others: FC-R603, FC-R563, FC-R460, FC-R350

⚠️ IMPORTANT WARNING: This bottom bracket, Press-Fit PF41-86.5 only This is for positions within the standard. Threaded BSA , BB86 (width 86.5mm, diameter 41mm, but the design is different) or BB30/PF30 compatible with other standards such as (axle diameter 30mm) IT IS NOT. It is essential to check your frame manufacturer's instruction manual.

📊 Technical Specifications and Weight

• Model: SM-BB71-41B

• BB Type: Press-Fit (PF41)

• Waist Measurements: 41mm (Diameter) x 86.5mm (Width)

• Axle Diameter: 24mm (Hollowtech II)

• Use: Road

• Material: Resin Casing, Steel Bearings

• Weight: Only 71 grams – superior lightness.

📦 Package Contents:

• 1 x Shimano Hollowtech II Press-Fit Bottom Bracket SM-BB71-41B

  • Left (drive-side) and right (non-drive-side) pressed bearing cups are supplied ready-to-use.

Manufacturer Stock Code (P/N): ISMBB7141B
Barcodes (Stock & Sales Tracking):

• EAN: 4524667434238

• UPC: 689228434233

🎯 Who is this Bottom Bracket for?

• PF41-86.5 hub frame owners: Anyone who can verify that your bicycle meets this standard by checking its technical specifications.

• Users with the 24mm Hollowtech II cranks listed above: To replace the old bottom bracket or adapt to a new lineup.

• For those seeking lightness and a quiet ride: For those who prefer the comfort that comes with a resin body and high-quality bearings.

• Those experiencing frame creaking problems: Those experiencing noise problems due to an old or incompatible bottom bracket are looking for a permanent solution with an original Shimano part.

Final Words: The Shimano SM-BB71-41B , when chosen for the right frame, is one of the hardest-working and often overlooked parts of your bike. It's a component that more than fulfills its role, guaranteeing the lossless transmission of every watt from your pedal to the wheel, while ensuring years of quiet and trouble-free operation. With proper installation, it will be the silent hero behind your riding experience.