The Hirobo HI2500056 set includes two 5 x 8 x 2.5 mm ball bearings intended for small RC helicopter rotating components such as rotor heads and gear carriers, offering a straightforward replacement option.
Confirm compatibility by matching inner and outer diameters and the width with the original component. For best results during installation, seat the bearing squarely and apply even pressure; avoid forcing at an angle to prevent damage to the race or balls. Only install where the 5 x 8 x 2.5 mm size is appropriate.
Properly maintained bearings reduce friction and improve shaft concentricity, which can positively affect rotor feel and response. Inspect for roughness or play, replace both bearings if wear is detected, and use a light lubricant suitable for small RC bearings when reassembling.
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