Shimano - 105 BB-5500 BSA 68-109.5

The 105 BB-5500 bottom bracket from Shimano is an Octalink bottom bracket with 8-speed gearing and a steel axle. The 109.5 mm versions are compatible with 2-way cranks. Even though it has been around for a while, this bottom bracket still holds up. Specifications Part Type: Bottom Bracket UPC: 689228134522 Bottom Bracket Shell Type: BSA (English) Compatible Bike Type: Road Bike Material: Aluminum, Steel Model: BB-5500 Number of Items: 1 Set Includes: Bottom Bracket Shell Width: 68 mm Compatibility: 2 speed Axle Diameter: 109.5mm Axle Type: Octalink (Road) E-Type Compatibility: no Chaincase Compatibility: no