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Shimano BB-RS500 Hollowtech II Bottom Bracket | ITA 70 mm
The Shimano BB-RS500 bottom bracket is recommended for use with Hollowtech II cranks featuring 24 mm axles, such as those from the Tiagra, Sora, and GRX series, as well as many other models without specific group sets.
It is suitable for various road bike frames with ITA bottom brackets and a shell width of 70 mm. The BB-RS500 stands out for its durability and enhanced sealing system, ensuring a longer lifespan and better protection against environmental factors.
ITA (Italian Threaded) is a bottom bracket version commonly used by Italian bicycle manufacturers. It is one of the two main types of bottom bracket threading, with the other being BSA (British) threading. The primary difference between ITA and BSA threading is their geometric layout.
Shimano's Hollowtech II technology represents an advanced crank and bearing system aimed at achieving the ideal balance of stiffness, weight, and rotational efficiency. The system integrates the bottom bracket with the right crank arm, using a 24 mm axle or bearing diameter, which is optimal for stability. High-quality bearing seals ensure a long service life for the component.
| Category | Road |
| BB Type | ITA Italian Threaded |
| Crank Brand | Shimano |
| Axle Type | Thread |
| Frame width (mm) | 70 |
| Axle Diameter (mm) | 24 (Hollowtech II) |
| Bearing material | Steel |
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