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Why use a 15T sprocket instead of a 16T? Makes it a lots easier to switch without changing chains. Or are you trying to save weight from chain and sprockets? As far as weight goes, there's about 40 pounds to be lost with a lithium battery and cf exhaust...but good luck finding a light exhaust that helps with fuel economy! I can't really see weight mattering much unless there are a lot of hills, though.
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