SKF Bottom Bracket JIS Square Taper BSC


Tired of overhauling your bottom bracket or replacing the bearings? 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 example, the non-drive-side balls measure 4.5 mm in diameter, whereas the standard cartridge bearings (61903) used in most other high-end cartridge bottom brackets use much smaller 2.8 mm balls. Smaller balls wear faster and can even break under high loads.

To keep the bearings running smoothly, SKF designed and patented multi-stage seals that retain the grease and keep out water and dirt. Other cartridge bottom brackets, even the most expensive models, are relatively simple designs. The bearings are separated from the elements only by rubber dust shields, which are not designed to keep out water.

10 year warranty includes the bearings.

BSC (British) Threads

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SKF bottom brackets are made entirely from stainless steel and aluminum – even the bearings – so they won’t rust or corrode. However, stainless steel is more brittle than Cromoly, so these bottom brackets only meet the “City/Trekking Bike” standards for fatigue resistance, and not the highest “Racing Bike” standards to which our other components are designed. This is the same for many other high-end bottom brackets, which also use stainless steel spindles, and SKF bottom brackets perform fine under most riders, including very strong ones. However, if you tend to break components, we suggest you look elsewhere for a bottom bracket.

Installation is simple, and requires only an ISIS-type bottom bracket tool. Do not use a “single-hook” bottom bracket wrench, as it can crack the hardened stainless steel of the BB shell.

The JIS taper is used on most Japanese and classic French cranks, including Stronglight and TA. It is also used for René Herse Cranks.

  • BAS-600 model
  • BSC or ITAL threading
  • Symmetric spindle
  • Spindle lengths: 107 110 113 116 121 126 mm
  • Silver right cup
  • Red left cup (silver cups available separately)

Not sure which BB you need? Check the resources on our Tech Support page.

  • 10 year warranty includes bearings
  • BSC (British) Threads
  • Designed for 68 mm bottom bracket shell.
  • For use with 73 mm BB shell (spindle length >113 mm), remove 1 mm spacer under the drive-side cup. The spindle will be 1.5 mm longer on the drive-side in this setup.
  • Roller bearings on drive side
  • Extra-large ball bearings on non-drive side
  • Patented seals
  • Entirely made from stainless steel and aluminum
  • Made in Germany
  • Meets EN “City/Trekking Bike” standard for fatigue resistance
  • Weight: 291 g (110 mm)
  • Click here for downloadable instructions for SKF Bottom Brackets, Rene Herse Cranks, and our chart for using the two together.

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