  We systematically construct and study smooth supersymmetric solutions in 5
dimensional N=1 Yang-Mills-Einstein supergravity. Our solution is based on the
ADHM construction of (dyonic) multi-instantons in Yang-Mills theory, which
extends to the gravity-coupled system. In a simple supergravity model obtained
from N=2 theory, our solutions are regular ring-like configurations, which can
also be interpreted as supertubes. By studying the SU(2) 2-instanton example in
detail, we find that angular momentum is maximized, with fixed electric charge,
for circular rings. This feature is qualitatively same as that of supertubes.
Related to the existence of this upper bound of angular momentum, we also check
the absence of closed timelike curves for the circular rings. Finally, in
supergravity and gauge theory models with non-Abelian Chern-Simons terms, we
point out that the solution in the symmetric phase carries electric charge
which does not contribute to the energy. A possible explanation from the
dynamics on the instanton moduli space is briefly discussed.
