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SKF Bottom Bracket – ISIS – Standard 68/70 BB Shell


Tired of ISIS bottom brackets that last only a season or two? The larger ISIS spindle leaves less room for the bearings. 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. Other modern cartridge bottom brackets, even the most expensive models, are relatively simple designs with exposed bearings that are separated from the elements only by rubber dust shields, which are not designed to keep out water.

10 year warranty includes the bearings.

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All parts of these SKF bottom brackets, including the bearings, are made from extra strong CrMo steel. Installation is simple, and requires only an ISIS-type bottom bracket tool.

For standard BB shells (BSC: 68 mm; ITAL: 70 mm).

Mountain and Road (BRI-300)

  • 108 mm spindle, ITAL, or FRENCH threading
  • 113 mm spindle, BSC or ITAL threading
  • BSC threaded, red left cup only.
  • ITAL threaded, silver left cup (red cup available separately).
  • FRENCH threaded, silver left cup only
  • 10 year warranty includes bearings
  • Roller bearings on drive side
  • Extra-large ball bearings on non-drive side
  • Patented seals
  • BSC: for 68 mm BB shells
  • ITAL: for 70 mm BB shells
  • Made in Germany
  • Weight: 268 g (108 mm)
  • Click here for downloadable instructions for SKF Bottom Brackets, René Herse Cranks, and our chart for using the two together.