  We study nearest neighbor random walks on fixed environments of $\mathbb{Z}$
composed of two point types : $(1/2,1/2)$ and $(p,1-p)$ for $p>1/2$. We show
that for every environment with density of $p$ drifts bounded by $\lambda$ we
have $\limsup_{n\rightarrow\infty}\frac{X_n}{n}\leq (2p-1)\lambda$, where $X_n$
is a random walk on the environment. In addition up to some integer effect the
environment which gives the best speed is given by equally spaced drifts.
