HSC BB86 / 92 Ceramic Adapter Bottom Bracket

Article number: 014-06-06
Availability: In stock (5)

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.

The BB86 (road) and BB92 (mountain) bottom bracket standards, developed jointly by Shimano and Scott Bicycles, are an extension of the Hollowtech II design which placed the bearings outside of a standard threaded bottom bracket shell to improve crankset stiffness and bearing durability. BB86 further improves upon this design by widening the bottom bracket shell so that the bearings are now encompassed within the frame and not in an external cup. Rather than threading the bearing cups into the shell, a BB86 bottom bracket is lightly press fit into the frame for a stiff, secure connection between the crankset and frame.

HSC's BB86 and BB92 bottom brackets represent affordable, high quality aftermarket options for Hollowtech II or GXP cranksets paired with BB86 or BB92 frames. These bottom brackets are CNC machined from high strength delrin thermoplastic and equipped with HSC's hybrid ceramic bearings.



These adapters are designed to fit frames with 86.5 mm or 91.5 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
  • Campagnolo Ultra-Torque - Designed to fit Campy Ulltra-Torque 25 mm spindle cranks
  • SRAM GXP - Designed to fit stepped 24 / 22 mm spindle cranks.
  • SRAM DUB - Designed to fit SRAM's proprietary DUB design, 29 mm spindle crank.
  • BB386 EVO - Designed to fit 30 mm spindle cranksets, sometimes referred to as "long spindle" BB30 cranksets.


Shell I.D. 41 mm
Shell Width Road MTB
  86.5 mm / 90 mm 91.5 / 104.5 / 107 / 121 / 132 mm
Crank Compatibility Shimano HTII SRAM GXP SRAM DUB Campy UT BB386 EVO
Crank Spindle 24 / 24 mm 24 / 22 mm 29 / 29 mm 25 / 25 mm 30 / 30 mm
Weight ~64g ~69g ~58g ~65g ~65g
Bearings 6805 - w7 29 x 42 x 7 6805 - w6 6806
Material Delrin Thermoplastic - Si3N4 Ceramic Hybrid
Tools / Installation Quality bearing press



To avoid frame damage, we recommend that these BB86 / 92 bottom bracket adapters be professionally installed using a proper bearing press.

Please feel free to contact us directly for technical questions.

0 stars based on 0 reviews