HSC BB90 / 95 Ceramic Adapter Bottom Bracket

Article number: 014-06-06
Availability: Out of stock

These hybrid ceramic bearing kits from HSC are designed to fit Trek's BB90 road and BB95 mountain direct-fit bottom bracket shells, and are available for either Shimano Hollowtech II or SRAM GXP cranksets.

HSC's ceramic hybrids use grade 3 silicon nitride (Si3N4) balls matched with hardened steel races and low-friction seals and retainers. The grade of the ball bearings refers to their sphericity the lower the number, the closer the ball is to being perfectly spherical, in thousandths of an inch. As a reference, the highest quality stainless steel ball used in bicycle applications is rated at grade 25.


These adapters are designed to fit frames with 90.5 mm or 95.5 mm wide bottom bracket shells. The option you require will depend on the crankset being used:

Shimano HTII - Designed to fit 24 mm spindle cranks

SRAM GXP - Designed to fit stepped 24 / 22 mm spindle cranks.


Shell I.D. 37 mm
Shell Width Road MTB
  90.5 mm 95.5 mm
Crank Compatibility Shimano HTII SRAM GXP
Crank Spindle 24 / 24 mm 24 / 22 mm
Weight ~41g ~47g
Material Aluminum - Si3N4 Ceramic Hybrid
Bearings 6805 - w7
Tools / Installation Quality bearing press



To avoid frame damage, we recommend that these BB90 / 95 bottom bracket adapters be professionally installed using a proper bearing press.

Please feel free to contact us directly for technical questions.

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