Shimano BB-ES300-AK Octalink Bottom Bracket

Shimano BB-ES300-AK bottom bracket - Octalink, chain case compatible

The Shimano BB-ES300-AK is an Octalink bottom bracket that is compatible with chain cases. Its 8-tooth contact surface increases the load capacity compared to a square model. A 1.8 mm spacer is included with the bottom bracket.

Specifications:

Application:

All Mountain, Touring, City

Type:

BSA

Shell Width:

68 mm

Axle Length:

121 mm

Axle Type:

Octalink (MTB)

E-Type Compatibility:

no

Chaincase Compatibility:

yes

Technical Information:

Bearings:

steel

Axle Material:

steel

Bottom Bracket Cup Material:

composite (left), steel (right)

Compatibility:

• Octalink crank arms with eight-speed splines for longer grooves (Octalink MTB)
• compatible with chaincase
• only for FC-M521: with enclosed spacer also compatible without chain case

Recommended for:

• FC-T521

Features:

• hollow construction

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 68x121:

Threads:

BSA

Shell Width:

68 mm

Axle Length:

121 mm

Manufacturer Number:

E-BBES300AKB21W

Contents:

• 1 x Shimano BB-ES300-AK bottom bracket
• 1 x spacer 1.8 mm

Order Together:

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