Shimano BB-R9100 Hollowtech II Bottom Bracket | ITA 70 mm

Shimano BB-R9100 Hollowtech II Bottom Bracket | ITA 70 mm

The Shimano BB-R9100 central axis is specially designed for use with Dura-Ace 11- and 12-speed cranksets. This central axis is characterized by its small ball bearings, which help reduce weight, and it utilizes Hollowtech II technology. It's an excellent choice for those looking to enhance their bike's performance with a high-quality central axis designed specifically for these top-of-the-line cranksets.

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 crankset and bearing system aimed at achieving the ideal balance of stiffness, weight, and rotational efficiency. The system integrates the bottom bearing 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.