http://www.cyclocrossworld.com/thorn...hainring-guard

+ one of the several chain catchers to keep it from coming off to the inside..
that wrap around the seat tube and reach to the chain, ...

Im less weight conscious, Surly single speed rings in stainless are fine..

you might prefer Ergal alloys.

a set : http://www.cyclocrossworld.com/thorn...-chainring-kit