  We fix integers $u,v \geq 1$, and consider an infinite binary tree
$\mathcal{T}^{(u,v)}(z)$ with a root node whose value is a positive rational
number $z$. For every vertex $a/b$, we label the left child as $a/(ua+b)$ and
right child as $(a+vb)/b$. The resulting tree is known as the
$(u,v)$-Calkin-Wilf tree. As $z$ runs over $[1/u,v]\cap \mathbb{Q}$, the vertex
sets of $\mathcal{T}^{(u,v)}(z)$ form a partition of $\mathbb{Q}^+$. When
$u=v=1$, the mean row value converges to $3/2$ as the row depth increases. Our
goal is to extend this result for any $u,v\geq 1$. We show that, when $z\in
[1/u,v]\cap \mathbb{Q}$, the mean row value in $\mathcal{T}^{(u,v)}(z)$
converges to a value close to $v+\log 2/u$ uniformly on $z$.
