HSC External Road Bottom Bracket

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

HSC's external threaded bottom brackets, machined from aluminum and anodized in various colors, feature high-grade ceramic bearings for smoothness and longevity. Compatible with 68mm BSA and 70mm Italian shells, and various cranksets, they boast ABEC-7 steel races and grade 3 Si3N4 ceramic balls. The 6805 bearings ensure durability, with nylon retainers and dual-lip seals for protection. Pre-lubricated with HSC ceramic grease and weighing 84 grams, these bottom brackets are designed for performance and backed for durability. Options for Shimano's 24 mm Hollowtech II cranksets, SRAM's stepped 24 / 22 mm GXP cranksets or SRAM DUB's 29 mm 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
Spindle 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 Abbey Bike's 16 notch tool or Park Tool's 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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