You'd pretty much have to have something to compare to in order to determine what gauge your spokes are. I'd ask the LBS. The best, most durable spokes are double butted. I like 14/15/14 gauge (the thicker 14 gauge sections are on the ends, and the thinner, 15 gauge section is in the middle). This allows the middle section to flex more than it would if it were the same as the ends, and therefore puts less stress on the ends, where breakage usually occurs. The most common cause of broken spokes, from my experience, is the tension being too low-