A 21.5x42x12mm cartridge bearing for a worn wheel hub bearing, built to the exact size the original ran so the fit and preload stay right.

Highlights

  • Chrome steel balls (ABEC 3) with SAE 52100 chrome steel races
  • Chrome steel cage
  • 2RS seals for wet and dust resistance
  • High-quality grease fill

Compatibility & fit

Sold by size — match 21.5x42x12mm (ID x OD x width) against the bearing you're replacing. This size is used across several positions (bottom bracket, hub, pedal or pivot) depending on the standard it's built into — confirm it matches the position you're replacing before fitting.

Black Bearing covers manufacturing defects on its bearings for the period stated by the distributor at the time of purchase; wear from normal use, incorrect fitment or contamination is not covered. For warranty support, return the product to Tune Cycles and we'll manage the claim with Black Bearing's Australian distributor.
  • Chrome steel balls (ABEC 3) with SAE 52100 chrome steel races
  • Chrome steel cage
  • 2RS seals for wet and dust resistance
  • High-quality grease fill
Bearing size (ID x OD x width)21.5x42x12mm
GradeChrome Steel B3 (ABEC 3)
SCV codeBBBG-UB-2154212-B3
SKU SCV-BBBG-UB-2154212-B3
Brand Black Bearing