HSC External Road Bottom Bracket

Article number: 010-04-01
Availability: In stock (4)

HSC's external, threaded bottom brackets are equipped with high quality ceramic bearings for superior smoothness, better performance, and longer life than manufacturers' stock bottom brackets. The aluminum bearing cups are forged and CNC machined, then anodized in a plethora of colors.

These bottom brackets are available for either English (BSA/ISO) or Italian threaded frame shells, with options for Shimano's 24 mm Hollowtech II cranksets, or SRAM's stepped 24 / 22 mm GXP cranksets.



HSC makes these bottom brackets designed to fit wide bottom bracket shells. The option you require will depend on the crankset being used:

  • Shimano HTII - Adapts to fit 24 mm spindle cranks
  • SRAM GXP - Adapts to fit stepped 24 / 22 mm spindle cranks.
  • SRAM DUB - Adapts to fit SRAM's proprietary DUB design, 29 mm spindle crank.


Shell I.D. Shell Width
English Italian English Italian
1.37" x 24 TPI 36 mm x 24 TPI 68 mm 70 mm
Crank Compatibility Shimano HTII SRAM GXP SRAM DUB-R
Shell Compatibility 24 / 24 mm 24 / 22 mm 29 / 29 mm
Material Aluminum
Bearings (2) - 6805 w6 - Si3N4 ceramic hybrid
Tools / Installation BSA / Italian use a 44 mm ID socket tool
  DUB - tool included with purchase
Weight ~84g



HSC Bottom Brackets may be installed using any Hollowtech II compatible tool, such as the Park Tool BBT-9. The SRAM DUB BB's come with a Tool for installation.

Please feel free to contact us directly for technical questions.

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