Bicycle Superstore

Shimano BB-ES300 73X121mm English Bottom Bracket

Shimano BB-ES300 73X121mm English Bottom Bracket - Main image
$20.39 $29.99 In stock

Category: Parts - Bottom Bracket

About Shimano BB-ES300 73X121mm English Bottom Bracket
Stiff and lightweight for efficient power transfer, durable spline reinforced construction. 8-splined OCTALINK interface increases the strength and rigidity of the entire assembly.

Features
8-splined OCTALINK technology

26g lighter weight than BB-ES25

Specifications
Model No: BB-ES300

Series: Shimano Alivo M4000 Series

Threaded bottom bracket shell width: 73mm

Axle length: 121mm

About Shimano
Shimano is a Japanese multinational manufacturer founded in 1921 by Shozaburo Shimano. They are well known as the largest bicycle component manufacturer in the world with their main manufacturing plants in Kunshan, China; Malaysia; and Singapore. Along with cycling components they also produce fishing tackle, and rowing equipment.

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Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

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Customer Reviews (5.0 / 5 · 3 reviews)

Brian ★★★★★

The splined Octalink interface locks in tight with zero creaking under hard pedaling, and the whole thing feels rock solid on my 73mm frame. Installed it in about twenty minutes and the power transfer is noticeably crisper than my old setup.

Claire ★★★★★

Swapped out my old square taper for this and the difference is night and day—the OCTALINK splines feel rock solid. Crank arm went on with no play, and the whole drivetrain is noticeably stiffer under load.

Evelyn ★★★★★

Installed this bottom bracket on my road bike and the spline-reinforced construction feels rock solid under heavy pedaling. The OCTALINK interface was a breeze to fit with my existing crank.