The asymptotic diameter of cyclohedra

It is shown here that the diameter of the $d$-dimensional cyclohedron is not greater than $\lceil 5d\mathrm{/}2\rceil -2$. It is also shown that the $5\mathrm{/}2$ coefficient in this upper bound is asymptotically sharp. More precisely, the $d$-dimensional cyclohedron has diameter at least $5d\mathrm{/}2-4\sqrt{d}-4$.