The Hirobo HI2500095 is a set of two ball bearings sized 4 x 11 x 4 mm, listed under part code #694ZZ for shielded construction. Designed as an RC-scale replacement part, this pack supplies two pcs of sealed bearings intended for small drivetrains, rotor assemblies and precision hub locations where a compact, low-profile bearing is required.
The bearings are useful for reducing friction in rotating assemblies and for restoring smooth operation when an original bearing shows play or roughness. When fitting, make sure the bearing seats evenly in its bore and that the mating shaft is clean and free of nicks; check for axial and radial play after installation to confirm correct fitment.
Maintenance notes: because these are shielded bearings they resist light contamination, but periodic inspection and replacement when wear appears will help preserve drivetrain efficiency and consistent tuning. Use the original model number HI2500095 or #694ZZ when sourcing replacements to ensure matching dimensions and sealing style.
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