Shimano BB-5500 Octalink Bottom Bracket | ITA 70 mm

Shimano BB-5500 Octalink Bottom Bracket | ITA 70 mm

The Shimano 105 BB-5500 bottom bracket is part of the Octalink system, distinguished by its 8-spline interface and durable steel axle. This model comes in one sizes: a 109.5 mm length suitable for bikes with double chainsetsDespite its longevity on the market, this bottom bracket remains highly regarded for its durability and reliability.

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 Octalink connection design, where the bottom bracket and cranksets are joined through an 8-splined interface, ensures increased stability and load capacity compared to older square-taper models. This structure provides more efficient force transmission and reduces wear and tear on both the cranksets and the bottom bracket, ensuring that the components last longer and perform more reliably.