+1.

46:16 is good, it's what I've got on my bike, If you have a 48 tooth chainring, a 17 tooth cog will give you about the same results (75.6 vs. 74.2 gear inches). Basically, you want a ratio just slightly under 3:1 from your cog to your lockring (although if you're a detail person, you can calculate the gear inches - http://software.bareknucklebrigade.c...it.applet.html)

If you want to do skids or go up hills more easily, a bigger cog / smaller chainring will be better, if you want to go faster on the downhills and flats and don't care about starting from stoplights or riding up hills being more difficult, a smaller cog / larger chainring will be better, but a 46:16 / 48:17 is a good combo to start with.