Maekiii Motor Tower - 9.8mm

Stock motor shaft bearings are often too loosely fitted to the gearbox, resulting in pinion misalignment and suboptimal meshing between the pinion and bevel gear. By having a more precisely fitted shaft bearing between the motor and gearbox shell, this issue is mitigated, resulting in better efficiency of the gear train and reduction of noise generated. NOTE: Bevel gear will need to be shimmed a bit higher comparing to loose shaft bearings. For long type motors only. Measure the opening in your gearbox shell with a caliper and pick according size. For example, if the opening is 9.75mm, pick 9.6mm. Most stock shaft bearings have 2pcs of 1/8" x 1/4" x 7/64" size ball bearings in them, take them from that and install into this. The same size bearing can also be found from motor end bells once disassembled.