CeramicSpeed BB ALPHA Bottom Bracket — T47/86 Shimano Road

A bottom bracket built to outlast your frame. The CeramicSpeed BB ALPHA for T47/86 pairs a 24 mm Shimano (or compatible) road crank with a threaded T47 frame that is 85–86 mm wide with bearings placed inboard — delivering the lowest-friction, longest-lasting bottom bracket CeramicSpeed has ever made.

Why riders choose BB ALPHA

Grade-3 Silicon Nitride ceramic balls in hardened stainless-steel races. Standard steel bottom brackets develop drag and play after a single wet season, so you end up replacing them every year and losing watts in between. The hand-built ceramic bearing system runs ultra-smooth from day one and stays smooth for the life of the frame — you feel less resistance on every pedal stroke and stop budgeting for a yearly bottom bracket swap.

Custom seals with 500% better moisture protection. Wet rides, washing, and grit are what actually kill bottom brackets — water gets past the seal and the bearing rusts from the inside. The redesigned BB ALPHA seal blocks moisture and contamination dramatically better than previous generations, so the bearing keeps spinning quiet and free through winter training, gravel detours, and every post-ride hose-down.

Simplified spacer tube + lighter cups, 10% lighter overall. Old-style bottom brackets needed a bag of spacers and a service manual to install correctly, and the cups added grams in the worst place on the bike. The new design installs in minutes with fewer parts to lose, and you save weight right at the bottom of the drivetrain where it matters for acceleration and climbing response.

Custom dust covers refined through 28 design iterations. Cheap dust covers pop loose, rattle, or let dirt in — exactly what you don't want on a €10k bike. The fitment-optimized covers stay seated and sealed under real road and race use, so the bearing stays clean and you don't hear any creaks or ticks coming from the BB shell.

Lifetime warranty. CeramicSpeed backs every BB ALPHA for life. You install it once and you're done.

What's in the box

• BB ALPHA bottom bracket for T47/86 frames, Shimano Road 24 mm
• UFO TECH All Round Bearing Grease (5 ml)
• CeramicSpeed decal

Fitment

• BB shell: T47 threaded, 85–86 mm wide (bearings placed inboard)
• Crank axle: 24 mm (Shimano road and compatible 24 mm cranks)
• Discipline: Road, Tri, Track
• Net weight: 96 g

Confirm your frame uses a T47 threaded shell at 85–86 mm width before ordering — T47/86 is found on many modern road and all-road frames (e.g. Trek, BMC, Argon 18, Allied). If you're unsure, contact us and we'll confirm fitment for your bike.