White Industries External BSA Bottom Bracket

White Industries external BSA style bottom brackets are made here in our shop and feature Enduro stainless steel angular contact bearings or optional Enduro XD-15 ceramic-hybrid radial bearings.  We offer them with three different bearing sizes to help you fit your favorite crank to your favorite bike.

“BSA” bottom bracket shells and cups are named after the Birmingham Small Arms Company which created the thread standard used in this system.  It’s also referred to as “British” or “English” style and is the most common type of system found on modern bicycles.  The “external” designation refers to the fact that the bearings will sit outboard of your frame’s bottom bracket shell as opposed to being tucked inside the shell as you would find on some styles of BSA bottom brackets.

Specifications

• 1.37” x 24 TPI threads (“BSA” threads)
• Designed to be used on 68mm or 73mm wide bottom bracket shells
• Enduro stainless steel angular contact bearings
  • Enduro XD15 ceramic-hybrid bearings optional
• Weight/pr (with bearings and seals)
  • 30mm: 83g
  • 29mm: 90g
  • 24mm: 84g
• Cup widths (external section of each cup, including seal)
  • 24mm: 10.5mm
  • 29mm: 11.5mm
  • 30mm: 11.5mm
• Thread depths
  • 24mm: 11mm
  • 29mm: 13mm
  • 30mm: 13mm
• Bearings
  • 24mm: Enduro SMRA 2437 LLB or CXD MR 2437 LLB
  • 29mm: Enduro S71806/29 LLB or CXD 6806/29 LLB
  • 30mm: Enduro S71806 LLB or CXD 6806 LLB
• Torque: 26-37 ft lbs (35-50 Nm)
• Tools: 12 notch/46mm
  • Park BBT-79 to BBT-79.3
  • Abbey BSA30
  • Enduro BBT-015
  • Race Face Cinch spanner
• Anodized with machine engraved logos
• Available in black, blue, gold, pink, purple, polished silver, red

Compatibility

• Designed to be used on threaded BSA 68mm or 73mm wide bottom bracket shells
• Comes in three bearing sizes to fit:
  • 30mm White Industries MR30 series cranks as well as other brands of 30mm spindle cranks
  • 29mm SRAM DUB cranks as well as other brands of 29mm spindle cranks
  • 24mm Shimano HollowTech II road and mountain cranks as well as other brands of 24mm spindle cranks
  • Not compatible with square taper style spindles
• Tools: 12 notch/46mm
  • Park BBT-79 to BBT-79.3
  • Abbey BSA30
  • Enduro BBT-015
  • Race Face Cinch spanner