CeramicSpeed BB ALPHA Bottom Bracket — T47a Shimano Road

A bottom bracket built to outlast your frame. The CeramicSpeed BB ALPHA pairs a 24 mm Shimano road crank with a T47a (T47 asymmetric) threaded frame, delivering the lowest-friction, longest-lasting bottom bracket CeramicSpeed has ever made — engineered for the modern threaded standard chosen by Trek, Pinarello, and most premium custom builders. 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 threaded T47 bottom brackets needed a bag of spacers and a service manual to install correctly with the asymmetric offset, 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 T47a (asymmetric) threaded frames, Shimano Road 24 mm • UFO TECH All Round Bearing Grease (5 ml) • CeramicSpeed decal Fitment BB shell: T47a / T47 asymmetric threaded (M47 × 1.0, asymmetric width) Crank axle: 24 mm (Shimano road and compatible 24 mm cranks) Discipline: Road, Tri Net weight: 94 g T47a is the asymmetric variant of T47, found on modern Trek (Madone, Émonda SLR), Pinarello Dogma, and many premium custom titanium and steel builds. Confirm with your frame manufacturer whether you have T47a or T47/86 — they are not interchangeable.