SKF Bottom Bracket – ISIS – 73 BB Shell

SKF Bottom Bracket - ISIS
SKF Bottom Bracket - ISIS

SKF Bottom Bracket – ISIS – 73 BB Shell


Tired of ISIS bottom brackets that last only a season or two? The large ISIS spindle leaves little room for the bearings, and most high-end bottom brackets use pressed-in cartridge bearings with tiny balls that wear quickly.

SKF designed their cartridge bottom bracket from the ground up to optimize strength and durability. The bearings run on races ground directly into the spindle and the shell, so SKF can use larger balls and rollers for optimum durability. For example, the non-drive-side balls measure 4.5 mm in diameter.

To keep the bearings running smoothly, SKF designed and patented multi-stage seals that retain the grease and keep out water and dirt. Two models are available:

Mountain (BXC-600)


Freeride (BFR-600)

  • Reinforced spindle (smaller bolt hole)
  • 118 mm spindle
  • Red left cup (silver cups available separately)
  • Requires smaller crank bolts


10 year warranty includes the bearings. Made in Germany.

  • BSC (British) treads
  • For 73 mm bottom bracket shell
  • Can be used with 68mm BB shell with 2.5 mm spacer (available separately).
  • Roller bearings on drive side
  • Extra-large ball bearings on non-drive side
  • Meets EN 'City/Trekking Bike' standard for fatigue resistance.
  • Weight: 291 g (110 mm)
  • Install with ISIS-type bottom bracket tool.
  • Do not use 'single-hook' wrench that can chip the cartridge.
  • Not sure which BB you need? Check the resources on our Tech Support page.
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