Shimano BB-ES51 Octalink Bottom Bracket

The BB-ES51 bottom bracket from Shimano - Versatile

The BB-ES51 is a versatile Shimano bottom bracket with Octalink construction and 8-speed gearing. It is compatible with older MTB cranks and the Tiagra FC-4401. Its axle is made of plated steel.

Specifications:

Application:

All Mountain, City

Type:

BSA

Shell Width:

68 mm, 73 mm

Axle Length:

113 mm, 118 mm, 121 mm, 126 mm

Axle Type:

Octalink (MTB)

E-Type Compatibility:

no

Chaincase Compatibility:

no

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)

Recommended for:

• FD-M530
• FC-M540
• FC-M510
• FC-M470
• FC-M440
• Tiagra FC-4401 (113 mm)
• Tiagra FC-4404 (121 mm)

Features:

• hollow construction
• oversized bottom bracket axle: large 22 mm hollow axle increases strength and load capacity while reducing weight
• multi-tooth connection between bottom bracket axle and cranks
• sealed compact bearings

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 68x113:

Threads:

BSA

Shell Width:

68 mm

Axle Length:

113 mm

Manufacturer Number:

E-BBES51B13

BSA 68x118:

Threads:

BSA

Shell Width:

68 mm

Axle Length:

118 mm

Manufacturer Number:

E-BBES51B18

BSA 68x121:

Threads:

BSA

Shell Width:

68 mm

Axle Length:

121 mm

Manufacturer Number:

E-BBES51B21

BSA 68x126:

Threads:

BSA

Shell Width:

68 mm

Axle Length:

126 mm

Manufacturer Number:

E-BBES51B26

BSA 73x113:

Threads:

BSA

Shell Width:

73 mm

Axle Length:

113 mm

Manufacturer Number:

E-BBES51C13

BSA 73x118:

Threads:

BSA

Shell Width:

73 mm

Axle Length:

118 mm

Manufacturer Number:

E-BBES51C18

BSA 73x121: sold out

Threads:

BSA

Shell Width:

73 mm

Axle Length:

121 mm

Manufacturer Number:

E-BBES51C21

Contents:

• 1 x Shimano BB-ES51 bottom bracket

Order Together:

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