CeramicSpeed BB ALPHA for T47/86 Shimano Road

 

The flagship ceramic bottom bracket purpose-built for Shimano 24mm axle cranksets and T47 threaded frames (85–86mm width). CeramicSpeed BB ALPHA features grade-3 Silicon Nitride ceramic balls and hardened stainless-steel races, hand-built in Denmark. With custom-engineered seals delivering 500% better moisture protection, ultra-low friction, a 10% weight reduction over previous generations at just 96g, and a lifetime warranty — this is the last bottom bracket you'll ever need. The T47 threaded design eliminates the need for press-fit tools. Also compatible with other 24mm axle crank brands beyond Shimano.

 

The CeramicSpeed BB ALPHA is the brand's flagship bottom bracket, and this version is purpose-built for Shimano and other 24mm axle cranksets (including Dura-Ace, Ultegra, 105, and GRX series) in T47 threaded frames with an 85–86mm shell width using an inboard bearing placement.

T47 is an increasingly popular bottom bracket standard that combines the reliability of threaded installation — eliminating the creaking and loosening issues common with press-fit systems — with a larger bearing cavity than traditional BSA. The 47mm diameter shell provides greater bearing capacity, translating to improved durability and efficiency. This BB ALPHA version uses an inboard bearing layout, meaning the bearings sit inside the frame shell for a more compact overall structure.

Where most bottom brackets compromise between lifespan and price, the BB ALPHA is engineered around one principle: outlast the frame it's installed in. At its core are grade-3 Silicon Nitride (Si₃N₄) ceramic balls — CeramicSpeed's highest-grade in-house produced bearing balls — paired with hardened stainless-steel races to ensure ultra-low friction and exceptional longevity even under high-RPM demands.

The sealing system went through 28 design iterations, with laboratory testing confirming a 500% improvement in moisture and contamination resistance over conventional designs. Whether you ride in rain, humidity, or dusty conditions, the BB ALPHA keeps performing. A newly simplified spacer tube design makes installation faster and more straightforward, while simultaneously achieving a 10% weight saving over the previous generation — coming in at just 96g net.

As a threaded design, the T47 standard can be installed and removed without specialised press-fit tooling, and future bearing maintenance or replacement is significantly more convenient. The 24mm axle diameter also ensures broad compatibility beyond Shimano, accommodating other crank brands that use the same spindle standard.

Every BB ALPHA unit is hand-assembled by technicians in Denmark and backed by CeramicSpeed's lifetime warranty.

 

 

Key Features

Ultra-Low Friction: Grade-3 Silicon Nitride ceramic balls paired with hardened stainless-steel races deliver minimal rolling resistance, converting every watt of power into forward motion.

500% Moisture Protection: Custom-designed seals and precision dust covers, refined through 28 iterations, dramatically improve waterproofing and contamination resistance to extend bearing life.

Lightweight Design: Optimised cup material and a super-light spacer tube achieve a 10% weight reduction over the previous generation, with a net weight of just 96g.

Corrosion Resistant by Design: Hardened stainless-steel races inherently resist corrosion without relying on additional coatings — particularly suited for Hong Kong's humid climate.

T47 Threaded Design: Threaded installation eliminates the need for press-fit tools and prevents the creaking and loosening issues common with press-fit bottom brackets, making installation and future servicing simpler and more reliable.

Inboard Bearing Layout: Bearings are placed inside the frame shell for a compact structure, while the T47's 47mm diameter provides greater bearing capacity than traditional BSA.

Shimano & 24mm Axle Compatible: Built for Shimano's 24mm spindle standard, including Dura-Ace, Ultegra, 105, and GRX series. Also compatible with other crank brands using a 24mm axle.

Simplified Installation: Fewer spacer variants streamline the installation process and reduce the chance of errors.

Serviceable Design: Bearing seals and dust covers can be individually replaced and maintained, extending overall product lifespan.

Lifetime Warranty: Backed by CeramicSpeed's official lifetime warranty programme for maximum peace of mind.

Hand-Built in Denmark: Each bearing unit is individually assembled and quality-inspected by Danish technicians.

 

In the Box

• CeramicSpeed BB ALPHA for T47/86 Shimano Road × 1
• UFO TECH All Round Bearing Grease 5ml × 1
• CeramicSpeed Decal × 1

Frame & Crank Compatibility

Compatible with all road bike frames featuring the T47 threaded bottom bracket standard (85–86mm shell width) with inboard bearing placement, paired with Shimano or other 24mm axle cranksets, including but not limited to Dura-Ace, Ultegra, 105, and GRX series. T47 is commonly found on newer high-end road and triathlon frames from brands such as Argon 18, Factor, Allied, Parlee, Bastion, and others.

Recommended Accessories

• CeramicSpeed Dual Socket Tool T45 Colnago/T47 
• CeramicSpeed Alloy Preload Bolt for Shimano Cranks 
• CeramicSpeed Bottom Bracket Seal and Dust Cover Service Tool