Shimano BB-5500 Octalink Bottom Bracket | BSA 68 mm

Shimano BB-5500 Octalink Bottom Bracket | BSA 68 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 two sizes: a 109.5 mm length suitable for bikes with double chainsets and a 118.5 mm length for those with triple chainsets. Despite its longevity on the market, this bottom bracket remains highly regarded for its durability and reliability.

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.