Originally Posted by carleton

It depends on your chainring. A gear ratio is just that...a ratio between the front chainring and rear cog. So, you must know what chainring you are going to use.

For conversation's sake, let's assume a common 48 tooth chainring. So, 48/16 = 3.0.

Find a ratio that is close to 3.0 on your current geared bike. 3.1 or 3.2 will be slightly higher (harder to push). 2.8 or 2.9 will be slightly lower (easier to push).

I hope this helps.