Revolver Series 14x25.4x6mm Chrome Steel Speed Rear Engine Bearing

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The Assault RC Revolver Series 14x25.4x6 Chrome Engine Bearing provides the maximum performance and reliability to your racing engine at a competitive price. The bearing contains 9 Abec5 52100 Chrome Steel Balls riding on an advanced poly inner cage and Chrome Steel 52100 Rings. It has no seals to allow for proper lubrication from the oil in your fuel.

Used In

  • Ultimate Racing: M-3X, M-3R, M-5S
  • O.S. Speed: B21, VZ-B, VZ-B V-Spec, VZ-B V-Spec Speed, & VZ-B V-Spec II WE, B2101, B2102, B2103
  • Novarossi: Plus 4 (2008), Plus 21-7T, P5 (Original), 421B, BS-21SB, & C5
  • RB: C5/C6, S3, S5, S7, TM928
  • Reds: M7T, M7TGT, R5, R5R, R5T, R5TTE
  • ProTek: 321B
  • Alpha
  • Jammin
  • Ninja
  • Picco
  • Precirotate: D5, PR21B, PR21BS, & PR21C
  • Trinity Drake
  • Flash Point


  • Diagnosing: If you hold the head of the engine with your hand and the rattling sound disappears then you have a worn-out rear bearing. The risks/issues of a bad rear bearing are not holding a tune, crank can get worn, and worst of all the bearing comes apart and eats your piston/sleeve.
  • Installation: The best way to install engine bearings is to use a bearing puller/installer. Reds Racing makes a very affordable version. For proper lubrication, face the open side where you can see the balls to the rear of the motor (not the clutch side).
  • Break-In: For the first run of these bearings, Assault RC suggests that you richin your motor up on the high-end needle so the balls will seat instead of skidding them. Always heat your engine up to 200F before cranking the engine    

Bearing Dimensions