CeramicSpeed Ceramic MTB Bottom Bracket - Threaded to 24mm (Shimano)

Friction losses that barely register on a road bike become genuinely meaningful on the trail — lower speeds mean wind resistance matters less, so drivetrain drag accounts for a larger share of what's slowing you down. The CeramicSpeed Ceramic MTB Bottom Bracket - Threaded to 24mm (Shimano) addresses that directly, pairing Grade 3 Silicon Nitride ceramic balls with hardened steel races in a threaded external cup design built for 73mm English-threaded shells and 24mm-spindle cranks.

Those ceramic balls aren't a marginal upgrade. CeramicSpeed's Grade 3 Silicon Nitride balls are manufactured to a surface finish and roundness specification that results in dramatically lower rolling resistance than standard steel — and significantly better than generic ceramic balls. They're assembled into the races in dust-free clean rooms, with the aluminum cups machined to tight tolerances and the bearings pressed in at CeramicSpeed's facility in Denmark. The result is a bottom bracket designed to last three to five times longer than conventional bearings, not just spin faster.

The threaded BSA external cup format means installation and removal follow the same process as a standard external bottom bracket — a traditional cup tool does the job. Available in black or red anodized finish, both in English threading to suit the vast majority of mountain bike frames.

CeramicSpeed Ceramic MTB Bottom Bracket Specs at a Glance

• Standard: BSA threaded external (English threading)
• Shell width: 73mm
• Spindle compatibility: 24mm (suits Shimano cranks)
• Bearing material: Grade 3 Silicon Nitride ceramic balls in hardened steel races
• Available colors: Black, Red