This is a rear bearing from Boca Bearings designed to fit the Novarossi P5X, 421BS, 528X and RB Concepts TM928 off-road competition buggy and truck engines. This bearing also fits recent Novarossi and RB Concepts engines that require the special 25.8 mm rear bearings. The bearing dimensions are 14mm inner, 25.8mm outer and 6mm thick. This bearing is open to allow oil to lubricate the bearings during use. This bearing will also fit any other .21 to .28 competition engine that uses the same bearing dimensions.
NOTE: This bearing should be installed so that the balls face
the rear of the engine (towards the backplate), in order to allow