CeramicSpeed Ceramic Race Bottom Bracket - EVO386 to 24mm (Shimano)

The CeramicSpeed Ceramic Race Bottom Bracket EVO386 to 24mm (Shimano) solves a real-world problem — your BB386 EVO frame shell doesn't have to limit you to a narrow range of cranks. This adapter bottom bracket lets you run a 24mm-spindle Shimano crankset in a BB386 EVO shell, pressing into the 86.5mm-wide, 46mm inner diameter shell with aluminum cups and sleeves machined to close tolerances.

The bearings are the reason this bottom bracket exists beyond mere compatibility. CeramicSpeed uses Grade 3 Silicon Nitride ceramic balls, assembled in dust-free clean rooms and pressed into hardened steel races — a process that yields measurably lower frictional resistance than standard steel bearings and a service life that, according to CeramicSpeed, runs three to five times longer. The ceramic balls are harder, smoother, and lighter than conventional steel balls, and they outperform standard ceramic spec on surface finish and hardness. The aluminum cups are machined by Rotor in Spain; final bearing assembly happens at CeramicSpeed in Denmark.

CeramicSpeed Ceramic Race Bottom Bracket Specs at a Glance

• Shell standard: BB386 EVO (86.5mm wide, 46mm inner diameter)
• Spindle compatibility: 24mm (Shimano)
• Bearing type: Grade 3 Silicon Nitride ceramic balls in hardened steel races
• Cup material: Aluminum
• Available colors: Black, Red