take your final drive gear ratio (probably 16/45 or something similar). divide the # of teeth on the front sprocket by # of teeth on the rear sprocket. this will give you a small number (0.3556 if you use my example). now do the same thing for your new gearing (15/45). divide again and you get 0.3333. now divide the new number by the old number.... you get 0.937, or 93.7%. so that means your top speed will be 93.7% lower. multiply this by your current top speed... probably around 180 (it will indicate higher than what it actually is). so you get 168.66 for your new top speed. make sense?
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sprocket/top speed
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