Shimano BB-ES300 Octalink Bottom Bracket

Shimano BB-ES300 Octalink bottom bracket - for MTB and Touring

The Shimano BB-ES300 Octalink bottom bracket with 8-speed gears fits MTB and touring cranks installed in BSA bottom brackets with 68 or 73 mm shell width. Compared to its predecessor the BB-ES25, it can save up to 25 grams of weight. This is the standard version, which is not compatible with E-Type or chain cases.

Specifications:

Application:

All Mountain, Touring, 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:

• FC-T521
• FC-T4010
• FC-T3010-8
• FC-M523
• FC-M522
• FC-M4000
• FC-M430-8
• FC-M3000-8
• FC-R345

Features:

• hollow construction
• stiff and lightweight for efficient power transmission
• robust construction with reinforced ribs
• 26 g lighter than BB-ES25
• fast and precise installation
• good control of the chainline with chain fixation

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-BBES300B13

BSA 68x118:

Threads:

BSA

Shell Width:

68 mm

Axle Length:

118 mm

Manufacturer Number:

E-BBES300B18

BSA 68x121:

Threads:

BSA

Shell Width:

68 mm

Axle Length:

121 mm

Manufacturer Number:

E-BBES300B21

BSA 68x126:

Threads:

BSA

Shell Width:

68 mm

Axle Length:

126 mm

Manufacturer Number:

E-BBES300B26

BSA 73x113:

Threads:

BSA

Shell Width:

73 mm

Axle Length:

113 mm

Manufacturer Number:

E-BBES300C13

BSA 73x118:

Threads:

BSA

Shell Width:

73 mm

Axle Length:

118 mm

Manufacturer Number:

E-BBES300C18

BSA 73x121:

Threads:

BSA

Shell Width:

73 mm

Axle Length:

121 mm

Manufacturer Number:

E-BBES300C21

BSA 73x126:

Threads:

BSA

Shell Width:

73 mm

Axle Length:

126 mm

Manufacturer Number:

E-BBES300C26

Contents:

• 1 x Shimano BB-ES300 bottom bracket

Order Together:

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