I'm not sure if you know this, but you will "grow" into bigger gears as the season progresses.
42/14 is exactly the same ratio as 48/16, which is the gear you will likely train on in the beginner classes and race with for the beginning of the season. This gear will probably become your warm up gear throughout the season.
When you are ready, your race gear will be the 42/13 which is the same as a 48/15. You'll probably race on that for most of the season.
Towards the last 1/3 of the season, you might grow out of the 42/13 but not be ready for a 12 yet, that's when you start fine tuning your gears with maybe a 43 or a 44.
So, for right now, all you need is a 14t cog for the beginner classes and the first few race days. Then buy a 13t. Before you go and buy chainrings, consider moving to 144BCD if you have the budget for it.
Also, go 1/8". 1/8" is the track standard. 3/32" is the exception to the rule.
Originally Posted by gtrob
Roadies can run tempo all year as that's what humans were designed for. If you want to be a cheetah, lay around and lick your paws more.