The Black Bearing R4 is a performance-upgrade cartridge bearing sized 6.35x15.88x4.98mm (ID x OD x width), built as a direct replacement for a worn bearing of this size in a hub, pivot, pulley or bottom bracket cup.

Highlights

  • Chrome steel balls to ABEC 5 tolerance
  • SAE52100 rings with an optimised internal profile
  • Chrome steel cage
  • Reinforced 2RS seals for better water and dust resistance

Bearing details

Designation R4, grade B5 (ABEC 5). Bore (ID) 6.35 mm, outside diameter (OD) 15.88 mm, width 4.98 mm. Sealed both sides (2RS) to keep water and grit out.

Compatibility & fit

Fits any hub, pivot, pulley or bottom bracket cup that calls up a R4 (6.35x15.88x4.98mm) cartridge bearing. Check the size stamped on your old bearing before ordering — Tune Cycles can confirm fitment and press the new bearing in as part of a bearing-replacement service.

We could not confirm a published warranty term for this line, so cover here is against manufacturing defects, with remedies as required under Australian Consumer Law. For warranty support, return the product to Tune Cycles and we'll manage the claim with Black Bearing's Australian distributor.
  • Chrome steel balls to ABEC 5 tolerance
  • SAE52100 rings with an optimised internal profile
  • Chrome steel cage
  • Reinforced 2RS seals for better water and dust resistance
  • 6.35x15.88x4.98mm (ID x OD x width), designation R4
DesignationR4
Bore (ID)6.35 mm
Outside diameter (OD)15.88 mm
Width4.98 mm
GradeB5 (ABEC 5)
Seal type2RS (double rubber seal)
SKU SCV-BBBG-UB-R4-B5
Brand Black Bearing

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