SG (Bearing Version 2)
Spin Gear Casings: SG (Bearing Version 2)
Holds and comes with one Shielded Ball Bearing.
Most common use is holding SG (Bearing Version 2) Shaft, where it provides better stability than Double Bearing Core and of course comes with the shaft by default - leaving only a Left Spin Gear, Wide Defense and one of the many suitable ARs needed to make a very competitive defensive combination.
However, Double Bearing Core offers better defense and solo spin with its two bearings, and the stability difference isn't enough to alter AR viability, only really coming into play if using a Metal Bit Chip (the rarest part in the game).
Nonetheless, still a very competitive choice for Defensive Zombies and technically the SG to use in a truly optimal combination (using an MBC).
Also notable is the ability to hold SG Grip Change Base Tip - one of the best Attack tips of the generation, providing an alternative to the incredibly (and practically unusably) fragile SG Grip Change Base, albeit at a lower height which makes it less effective against Circle Survivor Defense.