Boa Black Belly Steel bearings with builtin spacers


Boa Black Belly Steel bearings with builtin spacers

The Boa Blackbelly Steel Bearings are made to the same high precision tolerance as the  Blackbelly Ceramic Bearings. They feature inbuilt spacers and speedrings that prevent the shields from being crushed from overtightening. They are also filled with Boa industrial nano-ceramic grease, which helps to polish the steel balls over time and keep them performing at their optimum.

These bearings are based on our years of experience making high-quality bearings and have been tested by thousands of riders worldwide. They come packaged in a nice metal tin with a foam insert to keep the bearings nice and secure.


  • High precision tolerance
  • Inside diameter tolerance 8mm -0.007mm
  • Outside diameter tolerance 22mm -0.007mm
  • Inbuilt spacers and speedrings
  • Nano-ceramic grease
  • Tested by thousands of riders
  • Metal tin with foam insert


  • Smooth, fast rolling
  • Long-lasting performance
  • Durable construction
  • Easy to install

Included in package: Eight standard size bearings with builtin spacers.