Shimano Tiagra BB-RS501 Hollowtech II Threaded Bottom Bracket | The Bike Affair
Shimano Tiagra BB-RS501 Hollowtech II Threaded Bottom Bracket | The Bike Affair

Shimano Tiagra BB-RS501 Hollowtech II Threaded Bottom Bracket


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Shimano Tiagra BB-RS501 Hollowtech II Threaded Bottom Bracket

Shimano Tiagra - Bottom Bracket - Threaded - Hollowtech II - 68/70 mm shell width

Upgrade your bike's bottom bracket with the Shimano Tiagra BB-RS501 Hollowtech II Threaded Bottom Bracket. Designed for Shimano Tiagra components, this threaded bottom bracket offers durability and reliable performance for smooth pedaling on your rides.

Hollowtech II Technology: The BB-RS501 features Shimano's Hollowtech II technology, known for its lightweight and stiff design. This advanced technology enhances power transfer and efficiency, allowing you to maximize your pedaling efforts and enjoy a more responsive riding experience.

Compatible Shell Width: Designed to fit bikes with a 68mm or 70mm shell width, this bottom bracket provides versatile compatibility for a range of bike frames. Ensure a proper fit and seamless integration into your bike's drivetrain system.

Long-Lasting Performance: Equipped with a new seal construction, the Shimano Tiagra bottom bracket is built for long-lasting performance. The improved seal design effectively keeps out dirt, water, and other contaminants, ensuring smooth and reliable operation over time. Ride with confidence, knowing that your bottom bracket is protected and will deliver consistent performance mile after mile.

Easy Installation: The threaded design of the BB-RS501 makes installation quick and straightforward. With the necessary tools and a few simple steps, you can easily replace your old bottom bracket and enjoy the benefits of this high-quality Shimano component.


Specifications of Shimano Tiagra BB-RS501 Hollowtech II Threaded Bottom Bracket

Model No BB-RS501
Series Tiagra 4700 Series
Average Weight 93
Hollowtech II Bottom Bracket|Threaded Bottom Bracket Type Yes
Threaded Bottom Bracket Shell Width (mm)|68 Yes
Threaded Bottom Bracket Shell Width (mm)|70 Yes

Technology of Shimano Tiagra BB-RS501 Hollowtech II Threaded Bottom Bracket

Hollowtech II:

Providing the best balance of stiffness, strength, weight and rotating performance

The concept of Hollowtech II technology is focused on producing a superior crankset which will maximize a rider’s power transfer. The rigidity of the crankset ensures pedaling efficiency while its weight, a key element of the crankset, you want light, aids in cycling longer distances over which the rider needs to pedal more. Naturally, Shimano strove for the optimum balance between the conflicting needs of stiffness while producing a lightweight crank. Hollowtech technology is an ultra-lightweight hollow crankarm created by Shimano with the company’s own proprietary forging technology that also maintains rigidity.

The addition of Hollowtech II technology integrates the bottom bracket axle with the right crankarm for more stiffness and a weight savings to achieve a high-dimensional balance. Its outboard bottom bracket bearing system provides better weight distribution and more pedaling stability, allowing for more efficient power transfer.

The Hollowtech II crankset has been developed by pursuing the optimum balance of stiffness & rotating performance in a lightweight and beautiful crankset design.

High Precision Sealing: Moreover, Hollowtech II crankset has a high-precision sealing in the bearing area to increase durability maintaining the excellent rotating performance for long periods.

24mm Diameter Axle And Bearings: 

Why choose the 24mm axle and bearings for the Hollowtech II crankset? 

The diameter of the Bottom Bracket axle and bearings was of primary importance for the development because the Bottom Bracket axle area is tied to such key elements as stiffness, strength, weight and rotating performance.

What’s important is the total balance of crankset

In addition, taking the crankset as a whole, the total balance of crankarm rigidity, axle stiffness, bearing position and others is essential.

Indeed, the crankset is designed by careful consideration of the total balance of those elements to prevent breakage.

Outboard Bearing: For most frames with 68mm Bottom Bracket shells, Hollowtech II with 24mm axle can set the bearing position outside of the frame to provide better weight distribution and more stability.

24mm Diameter Axle And Bearings Provide Optimum Balance For The Crankset: After studying all these problems thoroughly, we made the decision to adopt the 24mm diameter axle and bearings, which have the optimum balance, for the Hollowtech II crankset.

In addition, an examination of the total crankset, including the crankarm and gears, proves the optimum balance of rigidity, weight and rotating performance for the ultimate transfer of power to your bike. Hollowtech II is simply the most optimized crankset design on the market.

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