"box extremum external bottom bracket 24mm black"

"Upgrading your hubs, bottom brackets and pulleywheels will give you exactly what you need. CeramicSpeed bearings reduce friction, improve power transfer and have greater longevity."

Learn more about CeramicSpeed

See all CeramicSpeed

"We move forward with a desire to deliver the best possible components to our customers and a determined spirit of competition."

See all Full Speed Ahead

"Lezyne's mission is to create the most advanced and beautiful cycling products, ever. Bicycle hand pumps, floor pumps, digital pumps, shock pumps, multi-tools, tire repair, bags, bottle cages, CO2 inflators, tool kits, saddle bags, organizers, shop tools and more."

See all Lezyne

"Simplicity is the hardest design principle to follow; It's at the heart of our approach to eclat."

See all Eclat

"W-T-P have always taken a lot of pride in ourselves and in building bikes that are capable of taking everything a rider throws at them. We are constantly at the forefront of developing and manufacturing materials that will with stand hard and furious riding and our designs are made to combat common breaks and bends."

See all We The People

"The world's best choose Cane Creek. A key element of Cane Creek's mission is to support the sport of cycling, including racing, charitable activities and cycling advocacy. Cane Creek believes strongly in the power of bicycles and their potential to effect positive change in our society. To that end, Cane Creek supports athletes and teams whose purpose encompasses more than competitive racing, such as getting more people on bikes, improving or promoting a healthy lifestyle, and making our world better through the use of a bike."

See all Cane Creek

Surly is a leading manufacturer of bicycle frames, and was one of the first Fat Bike manufacturers.

See all Surly

"Shimano practices good local citizenship, pursues continued access to those areas that are enjoyed by outdoor enthusiasts, and is committed to minimizing our impact on the environment."

See all Shimano

"Park Tool has been manufacturing bicycle specific tools since 1963. Based out of St. Paul Minnesota, we are the world's largest bicycle tool manufacturer. A long-term dedication to quality, innovation, and customer service has made Park Tool the first choice of professional and home bicycle mechanics around the world."

See all Park Tool

"Incremental enhancements. Perpetual improvements. Revolutionary Innovation. When advancements are continuously made to every attribute of every component, the result is overall performance that is simply second to none. And to real cycling enthusiasts, there is nothing more gratifying then achieving the ultimate ride. And the best part is we just keep making it better. This is what SRAM is all about."

See all SRAM

"Planet Bike was born from the heart of a cyclist and our goal is to make innovative, high quality, and practical bicycle accessories. Simply put, we strive to design and develop the best bicycle products in the world."

See all Planet Bike

"An icon in the mountain bike industry."

See all RockShox

"At Salsa, we believe a sense of adventure makes life better. The bicycle can be so much more than just a bike; it's a path to new places, new people, and amazing experiences."

See all Salsa

"Campagnolo puts all of its professionalism and expertise into the manufacture of its components in Via della Chimica plant in Vicenza. All production takes place exclusively within Campagnolo's own plants, so that product development can be a fully integrated part of the process. Every step in the process, from design and engineering to testing and industrialisation, takes place within Campagnolo facilities. Campagnolo even develops its own tools, machinery and technology so that it can produce only the very best components and wheels for racing bicycles."

See all Campagnolo

"Bicycle use has changed greatly in the last 10 years but we see a bright future in cycling and stay committed to developing products that everyone can understand. MINOURA will continue to enhance product development and planning to keep our 80 year promise of delivering great, well-built products."

See all Minoura

"Every year bikes change, styles and trends evolve, old bikes are in need of repairs and new bikes are waiting for that personal touch. We provide the means to keep your bike on the road and fun to ride!"

See all Sunlite

"We didn't invent the wheel, we simply made it better."

See all Halo Wheels

Dimension makes quality components to repair or custom-fit the vast majority of bikes being ridden today, and provide the accessories that make them fun to ride.

See all Dimension

"Finish Line has everything a cyclist needs for taking care of their bike and making sure it performs at its peak potential. These products range from bicycle chain lubricants to drivetrain degreasers, from bike washes, specialty brushes and chain cleaning tools, to fluorinated bearing greases and specialty suspension and brake fluids."

See all Finish Line

Answer BMX makes BMX racing components.

See all Answer

"At Birzman, our mission is simple, keep riders riding, exploring and living boundlessly. In doing all we can to keep you riding, we make commitments: We are committed to producing tools that are more functionally efficient and durable. We are committed to producing tools that share the same pride of place as your bicycle."

Out on the trail and on the open road is where enthusiast, pro-teams and pro-riders get to experience the Birzman difference.

See all Birzman

These models are available for online purchasing and can be shipped directly to you.

Our Lowest Price - This product is ineligible for additional discounts or rebates.

Length

The bottom bracket shell width is the width, in millimeters, of the frame where the bottom bracket is mounted.

Bottom brackets must fit the frames interface type. For example, an english threaded bottom bracket can only be installed on a frame that accepts english threading.

Shimano Hollowtech II is Shimano's 24mm spindle standard.

BB30 / PF30 bottom brackets accept cranks with 30mm spindles and are available in a variety of shell widths.

DUB is a SRAM standard, which stands for Durable Unified Bottom bracket. DUB cranks have a 28.99mm spindle.

In Store products are available to view in our showroom. In Store orders usually ship the same or next business day.

Recently added to our product selection.

GXP is a SRAM standard. The cranks have a 24mm spindle on the drive side and a 22mm spindle on the non-drive side.

386 EVO bottom brackets are a variant of PF30. They accept cranks with a 30mm spindle and shell width of 86.5mm.

e*Thirteen P3 connect cranks use a 30mm spindle.

RaceFace CINCH bottom brackets are for 30mm spindle cranks.

Rotor 3D+ is for 30mm spindle cranks.

Buy this product and your entire order ships for free.

Some orders are inelligible for delivery discounts. See offer details for disqualifying products and destinations.

sort by largest discount