Hirobo HI2500086 Ball Bearing Set — 3 x 7 x 3 mm, 2 pcs  [HI2500086]

Small bearings to refine model performance

Delivered as two pcs of 3 x 7 x 3 mm bearings, this set is aimed at hobby-scale helicopter and model installations. These replacement parts reduce friction at rotating joints and support shafts in miniature drivetrains and rotor linkages.

Practical points for tuners:

• Pack details: 2 pcs of 3 x 7 x 3 mm bearings included; model reference HI2500086.
• Press-fit advice: use a soft-faced driver on the outer race and a clean, accurately sized bore; avoid hammering the bearing directly and check shaft clearance before finishing assembly.
• Service tips: periodically check for smooth spin and debris, replace bearings that feel rough or loose, and follow recommended lubrication routines after identifying seal type.
• Tuning impact: installing fresh low-friction bearings can sharpen control response and reduce play, improving tail and drivetrain stability on light models.