Wheel Classes in Kontsevich Graph Complex and Merkulov's Low-Valence Conjecture

We show that the wheel classes in the Kontsevich graph complex $G{C}_d$ admit representatives supported on graphs with only $3$- and $4$-valent vertices. This verifies that Merkulov’s low-valence conjecture holds for the wheel classes. More precisely, for every $m\ge 2$, we prove that the wheel graph $W_{2m+1}$ is homologous to an explicit linear combination of $2^{m-2}$ graphs, each having only $3$- and $4$-valent vertices.