This is a reasonably strong and useful gear. This is the
smallest gear that can be operated with a LEGO chain, and
it’s a popular one thanks to its convenient size. As of early
2011, it was replaced in LEGO sets by a slightly updated version (see Figure 5-15). The shape of the new version’s outer
rim is exactly the same, whereas the structure in the middle
of it has been reinforced. The new version is ge