Shimano Bottom Brackets Threaded BSA | Tiagra BB-RS501 Hollowtech II 68/70mm

Shimano Tiagra Threaded Hollowtech II, Bottom Bracket 68/70 mm shell width
The Shimano Tiagra bottom bracket uses a new seal construction for long-lasting performance.

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 that will maximize a rider’s power transfer. The rigidity of the crankset ensures pedalling 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 weight savings to achieve a high-dimensional balance. Its outboard bottom bracket bearing system provides better weight distribution and more pedalling 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, the HOLLOWTECH II crankset has a high-precision sealing in the bearing area to increase durability maintaining excellent rotating performance for long periods.

Specifications

• Model No: BB-RS501
• Series: Sora R3000 Series
• Average weight: 93
• Hollowtech II bottom bracket|Threaded bottom bracket type: ✔
• Threaded bottom bracket shell width (mm)|68: ✔
• Threaded bottom bracket shell width (mm)|70: ✔

SKU#

• BSA: EBBRS501B: Shell Width: 68mm
• BSA: EBBRS501I: Shell Width: 70mm

*Note: Images are for representational purposes only. Actual size/packaging varies with product type/size.

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