On my SS I run a 32:16 or 2:1 ratio. This seems to be the norm for running off road on average terrain. Depending on the geography of the land you ride on, it might be necessary to adjust the ratio slightly. To answer your question, it all depends on the number of teeth on your front sprockets and on the cassette, chances are that there might be more than one combination of gears on your bike that would get you close to the 2:1 ratio. Just count the teeth on your sprockets and on the cassette and see what you come up with.