Shimano 105 BB-5500 Octalink Bottom Bracket

The Shimano 105 BB-5500 bottom bracket has been working perfectly for a long time

The 105 BB-5500 bottom bracket from Shimano is an Octalink bottom bracket with an 8-splined interface and a steel axle. The 109.5 mm versions are compatible with 2x cranks, the 118.5 mm versions with 3x cranks. Even though it has been around for a while, this bottom bracket still holds up.

Specifications:

Application:

Road

Series:

105 5500

Type:

BSA, ITA

Shell Width:

68 mm, 70 mm

Axle Length:

109.5 mm, 118.5 mm

Axle Type:

Octalink (Road)

E-Type Compatibility:

no

Chaincase Compatibility:

no

Technical Information:

Bearings:

steel

Axle Material:

steel

Bottom Bracket Cup Material:

aluminium

Compatibility:

• Octalink crank arms with eight-speed splines for shorter grooves (Octalink MTB)

Features:

• 8-splined interface of bottom bracket axle and crank

Technology:

Octalink
In Shimano's Octalink system, the bottom bracket and crank are connected by an 8-tooth contact surface. This provides greater rigidity and greater load capacity, especially compared to conventional square systems.

Models:

BSA 68x109.5:

Threads:

BSA

Shell Width:

68 mm

Axle Length:

109.5 mm

Compatibility:

2x

Manufacturer Number:

E-BB5500B09

BSA 68x118.5:

Threads:

BSA

Shell Width:

68 mm

Axle Length:

118.5 mm

Compatibility:

3-speed

Manufacturer Number:

E-BB5500B18

ITA 70x118.5:

Threads:

ITA

Shell Width:

70 mm

Axle Length:

118.5 mm

Compatibility:

3-speed

Manufacturer Number:

E-BB5500I18

Contents:

• 1 x Shimano BB-5500 bottom bracket

Order Together:

• bottom bracket tool TL-UN66 or TL-UN74-S in combination with wrench TL-FC31