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@Momentum
48x17 is actually slightly higher than average for a street gear. You calculate gear inches (roughly) by doing this: 48/17 x 27 (27 inches is approx wheel diameter). That gives 76 gear inches. Most people recommend something around 68 - 72 for the street to give good cadence at an average speed. if you are not used to spinning a gear then it will feel a bit odd, but it is the most efficient and best for your knees way to ride. 48/15 is a lowish track gear and will be pretty hard on your knees on the street. If you wanna work then learn to spin 48x17 at 25 mph for an hour :)
Everything MA3K said is spot on as well.