ceramic mtb bsa bottom bracket

There appears to be a revival of the threaded BSA bottom brackets. While those of you already rockin' threaded BBs on your mountain bikes may dismiss the flurry of attention, many bike manufacturers are migrating back to this classic BB design.

BSA is the classic English thread for mountain bikes. Frame shell width is typically 73mm with a 1.37"x24tpi thread. Other frame widths are 68mm on vintage frames, 83 mm for downhill bikes and 100 for fat bikes.

Threaded bottom brackets are known for the durability and simplicity. What can you do to improve upon this classic design? Add ceramic bearings, of course.

Remember not to install a mtb version of a threaded bottom bracket on your non-mountain bike frame. Why?

Chances are your road frame bottom bracket shell will be narrower and the spacing will be off because the mtb version has larger cups. Click over to our page dedicated to road BSA bottom brackets for more options.

Also, our mtb threaded bottom brackets ship only with cross seals better protection from the trail.


  • Road and off-road specific seal options to keep your road, triathlon, TT, cross and mountain bikes running smoothly
  • Designed to fit any crank and frame without adapters or fuss factor
  • 2-Year, very few questions asked, confidence inspiring warranty

Choose Your BSA Threaded Bottom Bracket Type

Get Help Finding The Right Bottom Bracket

Still need help finding the right BSA bottom bracket for your mountain bike? Send us a note and we'll be happy to help you find the exact bottom bracket for your frame.

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